nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <unistd.h>
  26 #include <limits.h>
  27
  28 #include <libfirm/firm.h>
  29 #include <libfirm/adt/obst.h>
  30 #include <libfirm/be.h>
  31
  32 #include "ast2firm.h"
  33
  34 #include "adt/error.h"
  35 #include "adt/array.h"
  36 #include "adt/strutil.h"
  37 #include "adt/util.h"
  38 #include "symbol_t.h"
  39 #include "token_t.h"
  40 #include "type_t.h"
  41 #include "ast_t.h"
  42 #include "entity_t.h"
  43 #include "parser.h"
  44 #include "diagnostic.h"
  45 #include "lang_features.h"
  46 #include "types.h"
  47 #include "type_hash.h"
  48 #include "mangle.h"
  49 #include "walk.h"
  50 #include "warning.h"
  51 #include "printer.h"
  52 #include "entitymap_t.h"
  53 #include "driver/firm_opt.h"
  54
  55 typedef struct trampoline_region trampoline_region;
  56 struct trampoline_region {
  57         ir_entity        *function;    /**< The function that is called by this trampoline */
  58         ir_entity        *region;      /**< created region for the trampoline */
  59 };
  60
  61 fp_model_t firm_fp_model = fp_model_precise;
  62
  63 static const backend_params *be_params;
  64
  65 static ir_type *ir_type_char;
  66 static ir_type *ir_type_wchar_t;
  67
  68 /* architecture specific floating point arithmetic mode (if any) */
  69 static ir_mode *mode_float_arithmetic;
  70
  71 /* alignment of stack parameters */
  72 static unsigned stack_param_align;
  73
  74 static int        next_value_number_function;
  75 static ir_node   *continue_label;
  76 static ir_node   *break_label;
  77 static ir_node   *current_switch;
  78 static bool       saw_default_label;
  79 static entity_t **inner_functions;
  80 static ir_node   *ijmp_list;
  81 static ir_node  **ijmp_blocks;
  82 static bool       constant_folding;
  83
  84 #define PUSH_BREAK(val) \
  85         ir_node *const old_break_label = break_label; \
  86         ((void)(break_label = (val)))
  87 #define POP_BREAK() \
  88         ((void)(break_label = old_break_label))
  89
  90 #define PUSH_CONTINUE(val) \
  91         ir_node *const old_continue_label = continue_label; \
  92         ((void)(continue_label = (val)))
  93 #define POP_CONTINUE() \
  94         ((void)(continue_label = old_continue_label))
  95
  96 #define PUSH_IRG(val) \
  97         ir_graph *const old_irg = current_ir_graph; \
  98         ir_graph *const new_irg = (val); \
  99         ((void)(current_ir_graph = new_irg))
 100
 101 #define POP_IRG() \
 102         (assert(current_ir_graph == new_irg), (void)(current_ir_graph = old_irg))
 103
 104 static const entity_t     *current_function_entity;
 105 static ir_node            *current_function_name;
 106 static ir_node            *current_funcsig;
 107 static ir_graph           *current_function;
 108 static translation_unit_t *current_translation_unit;
 109 static trampoline_region  *current_trampolines;
 110 static ir_type            *current_outer_frame;
 111 static ir_node            *current_static_link;
 112 static ir_entity          *current_vararg_entity;
 113
 114 static entitymap_t  entitymap;
 115
 116 static struct obstack asm_obst;
 117
 118 typedef enum declaration_kind_t {
 119         DECLARATION_KIND_UNKNOWN,
 120         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 121         DECLARATION_KIND_GLOBAL_VARIABLE,
 122         DECLARATION_KIND_LOCAL_VARIABLE,
 123         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 124         DECLARATION_KIND_PARAMETER,
 125         DECLARATION_KIND_PARAMETER_ENTITY,
 126         DECLARATION_KIND_FUNCTION,
 127         DECLARATION_KIND_COMPOUND_MEMBER,
 128         DECLARATION_KIND_INNER_FUNCTION
 129 } declaration_kind_t;
 130
 131 static ir_type *get_ir_type_incomplete(type_t *type);
 132
 133 static void enqueue_inner_function(entity_t *entity)
 134 {
 135         if (inner_functions == NULL)
 136                 inner_functions = NEW_ARR_F(entity_t *, 0);
 137         ARR_APP1(entity_t*, inner_functions, entity);
 138 }
 139
 140 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 141 {
 142         const entity_t *entity = get_irg_loc_description(irg, pos);
 143
 144         if (entity != NULL) {
 145                 source_position_t const *const pos = &entity->base.source_position;
 146                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 147         }
 148         return new_r_Unknown(irg, mode);
 149 }
 150
 151 static src_loc_t dbg_retrieve(const dbg_info *dbg)
 152 {
 153         source_position_t const *const pos = (source_position_t const*)dbg;
 154         if (pos) {
 155                 return (src_loc_t){ pos->input_name, pos->lineno, pos->colno };
 156         } else {
 157                 return (src_loc_t){ NULL, 0, 0 };
 158         }
 159 }
 160
 161 static dbg_info *get_dbg_info(const source_position_t *pos)
 162 {
 163         return (dbg_info*) pos;
 164 }
 165
 166 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 167                                     const type_dbg_info *dbg)
 168 {
 169         assert(dbg != NULL);
 170         print_to_buffer(buffer, buffer_size);
 171         const type_t *type = (const type_t*) dbg;
 172         print_type(type);
 173         finish_print_to_buffer();
 174 }
 175
 176 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 177 {
 178         return (type_dbg_info*) type;
 179 }
 180
 181 /* is the current block a reachable one? */
 182 static bool currently_reachable(void)
 183 {
 184         ir_node *const block = get_cur_block();
 185         return block != NULL && !is_Bad(block);
 186 }
 187
 188 static void set_unreachable_now(void)
 189 {
 190         set_cur_block(NULL);
 191 }
 192
 193 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 194
 195 static ir_node *_expression_to_firm(const expression_t *expression);
 196 static ir_node *expression_to_firm(const expression_t *expression);
 197
 198 static unsigned decide_modulo_shift(unsigned type_size)
 199 {
 200         if (architecture_modulo_shift == 0)
 201                 return 0;
 202         if (type_size < architecture_modulo_shift)
 203                 return architecture_modulo_shift;
 204         return type_size;
 205 }
 206
 207 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 208 {
 209         unsigned flags = get_atomic_type_flags(kind);
 210         unsigned size  = get_atomic_type_size(kind);
 211         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 212             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 213                 switch (size) {
 214                 case 4:  return get_modeF();
 215                 case 8:  return get_modeD();
 216                 default: panic("unexpected kind");
 217                 }
 218         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 219                 char            name[64];
 220                 unsigned        bit_size     = size * 8;
 221                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 222                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 223
 224                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 225                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 226                                     modulo_shift);
 227         }
 228
 229         return NULL;
 230 }
 231
 232 /**
 233  * Initialises the atomic modes depending on the machine size.
 234  */
 235 static void init_atomic_modes(void)
 236 {
 237         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 238         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 239                 if (atomic_modes[i] != NULL)
 240                         continue;
 241                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 242         }
 243 }
 244
 245 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 246 {
 247         assert(kind <= ATOMIC_TYPE_LAST);
 248         return atomic_modes[kind];
 249 }
 250
 251 static ir_node *get_vla_size(array_type_t *const type)
 252 {
 253         ir_node *size_node = type->size_node;
 254         if (size_node == NULL) {
 255                 size_node = expression_to_firm(type->size_expression);
 256                 type->size_node = size_node;
 257         }
 258         return size_node;
 259 }
 260
 261 static unsigned count_parameters(const function_type_t *function_type)
 262 {
 263         unsigned count = 0;
 264
 265         function_parameter_t *parameter = function_type->parameters;
 266         for ( ; parameter != NULL; parameter = parameter->next) {
 267                 ++count;
 268         }
 269
 270         return count;
 271 }
 272
 273 /**
 274  * Creates a Firm type for an atomic type
 275  */
 276 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 277 {
 278         ir_mode        *mode      = atomic_modes[akind];
 279         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 280         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 281         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 282
 283         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 284         set_type_alignment_bytes(irtype, alignment);
 285
 286         return irtype;
 287 }
 288
 289 /**
 290  * Creates a Firm type for a complex type
 291  */
 292 static ir_type *create_complex_type(const atomic_type_t *type)
 293 {
 294         atomic_type_kind_t  kind = type->akind;
 295         ir_mode            *mode = atomic_modes[kind];
 296         ident              *id   = get_mode_ident(mode);
 297
 298         (void) id;
 299
 300         /* FIXME: finish the array */
 301         return NULL;
 302 }
 303
 304 /**
 305  * Creates a Firm type for an imaginary type
 306  */
 307 static ir_type *create_imaginary_type(const atomic_type_t *type)
 308 {
 309         return create_atomic_type(type->akind, (const type_t*)type);
 310 }
 311
 312 /**
 313  * return type of a parameter (and take transparent union gnu extension into
 314  * account)
 315  */
 316 static type_t *get_parameter_type(type_t *orig_type)
 317 {
 318         type_t *type = skip_typeref(orig_type);
 319         if (is_type_union(type)
 320                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 321                 compound_t *compound = type->compound.compound;
 322                 type                 = compound->members.entities->declaration.type;
 323         }
 324
 325         return type;
 326 }
 327
 328 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 329 {
 330         type_t        *return_type  = skip_typeref(function_type->return_type);
 331
 332         int            n_parameters = count_parameters(function_type)
 333                                        + (for_closure ? 1 : 0);
 334         int            n_results    = is_type_void(return_type) ? 0 : 1;
 335         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 336         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 337
 338         if (!is_type_void(return_type)) {
 339                 ir_type *restype = get_ir_type(return_type);
 340                 set_method_res_type(irtype, 0, restype);
 341         }
 342
 343         function_parameter_t *parameter = function_type->parameters;
 344         int                   n         = 0;
 345         if (for_closure) {
 346                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 347                 set_method_param_type(irtype, n, p_irtype);
 348                 ++n;
 349         }
 350         for ( ; parameter != NULL; parameter = parameter->next) {
 351                 type_t  *type     = get_parameter_type(parameter->type);
 352                 ir_type *p_irtype = get_ir_type(type);
 353                 set_method_param_type(irtype, n, p_irtype);
 354                 ++n;
 355         }
 356
 357         bool is_variadic = function_type->variadic;
 358
 359         if (is_variadic)
 360                 set_method_variadicity(irtype, variadicity_variadic);
 361
 362         unsigned cc = get_method_calling_convention(irtype);
 363         switch (function_type->calling_convention) {
 364         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 365         case CC_CDECL:
 366 is_cdecl:
 367                 set_method_calling_convention(irtype, SET_CDECL(cc));
 368                 break;
 369
 370         case CC_STDCALL:
 371                 if (is_variadic)
 372                         goto is_cdecl;
 373
 374                 /* only non-variadic function can use stdcall, else use cdecl */
 375                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 376                 break;
 377
 378         case CC_FASTCALL:
 379                 if (is_variadic)
 380                         goto is_cdecl;
 381                 /* only non-variadic function can use fastcall, else use cdecl */
 382                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 383                 break;
 384
 385         case CC_THISCALL:
 386                 /* Hmm, leave default, not accepted by the parser yet. */
 387                 break;
 388         }
 389
 390         if (for_closure)
 391                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 392
 393         const decl_modifiers_t modifiers = function_type->modifiers;
 394         if (modifiers & DM_CONST)
 395                 add_method_additional_properties(irtype, mtp_property_const);
 396         if (modifiers & DM_PURE)
 397                 add_method_additional_properties(irtype, mtp_property_pure);
 398         if (modifiers & DM_RETURNS_TWICE)
 399                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 400         if (modifiers & DM_NORETURN)
 401                 add_method_additional_properties(irtype, mtp_property_noreturn);
 402         if (modifiers & DM_NOTHROW)
 403                 add_method_additional_properties(irtype, mtp_property_nothrow);
 404         if (modifiers & DM_MALLOC)
 405                 add_method_additional_properties(irtype, mtp_property_malloc);
 406
 407         return irtype;
 408 }
 409
 410 static ir_type *create_pointer_type(pointer_type_t *type)
 411 {
 412         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 413         type_t        *points_to    = type->points_to;
 414         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 415         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 416
 417         return irtype;
 418 }
 419
 420 static ir_type *create_reference_type(reference_type_t *type)
 421 {
 422         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 423         type_t        *refers_to    = type->refers_to;
 424         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 425         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 426
 427         return irtype;
 428 }
 429
 430 static ir_type *create_array_type(array_type_t *type)
 431 {
 432         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 433         type_t        *element_type    = type->element_type;
 434         ir_type       *ir_element_type = get_ir_type(element_type);
 435         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 436
 437         const int align = get_type_alignment_bytes(ir_element_type);
 438         set_type_alignment_bytes(irtype, align);
 439
 440         if (type->size_constant) {
 441                 int n_elements = type->size;
 442
 443                 set_array_bounds_int(irtype, 0, 0, n_elements);
 444
 445                 size_t elemsize = get_type_size_bytes(ir_element_type);
 446                 if (elemsize % align > 0) {
 447                         elemsize += align - (elemsize % align);
 448                 }
 449                 set_type_size_bytes(irtype, n_elements * elemsize);
 450         } else {
 451                 set_array_lower_bound_int(irtype, 0, 0);
 452         }
 453         set_type_state(irtype, layout_fixed);
 454
 455         return irtype;
 456 }
 457
 458 /**
 459  * Return the signed integer type of size bits.
 460  *
 461  * @param size   the size
 462  */
 463 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 464                                                  unsigned size,
 465                                                                                                  const type_t *type)
 466 {
 467         static ir_mode *s_modes[64 + 1] = {NULL, };
 468         ir_type *res;
 469         ir_mode *mode;
 470
 471         if (size <= 0 || size > 64)
 472                 return NULL;
 473
 474         mode = s_modes[size];
 475         if (mode == NULL) {
 476                 char name[32];
 477
 478                 snprintf(name, sizeof(name), "bf_I%u", size);
 479                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 480                 s_modes[size] = mode;
 481         }
 482
 483         type_dbg_info *dbgi = get_type_dbg_info_(type);
 484         res                 = new_d_type_primitive(mode, dbgi);
 485         set_primitive_base_type(res, base_tp);
 486
 487         return res;
 488 }
 489
 490 /**
 491  * Return the unsigned integer type of size bits.
 492  *
 493  * @param size   the size
 494  */
 495 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 496                                                    unsigned size,
 497                                                                                                    const type_t *type)
 498 {
 499         static ir_mode *u_modes[64 + 1] = {NULL, };
 500         ir_type *res;
 501         ir_mode *mode;
 502
 503         if (size <= 0 || size > 64)
 504                 return NULL;
 505
 506         mode = u_modes[size];
 507         if (mode == NULL) {
 508                 char name[32];
 509
 510                 snprintf(name, sizeof(name), "bf_U%u", size);
 511                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 512                 u_modes[size] = mode;
 513         }
 514
 515         type_dbg_info *dbgi = get_type_dbg_info_(type);
 516         res = new_d_type_primitive(mode, dbgi);
 517         set_primitive_base_type(res, base_tp);
 518
 519         return res;
 520 }
 521
 522 static ir_type *create_bitfield_type(const entity_t *entity)
 523 {
 524         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 525         type_t *base = skip_typeref(entity->declaration.type);
 526         assert(is_type_integer(base));
 527         ir_type *irbase = get_ir_type(base);
 528
 529         unsigned bit_size = entity->compound_member.bit_size;
 530
 531         if (is_type_signed(base)) {
 532                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 533         } else {
 534                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 535         }
 536 }
 537
 538 /**
 539  * Construct firm type from ast struct type.
 540  */
 541 static ir_type *create_compound_type(compound_type_t *const type, bool const incomplete)
 542 {
 543         compound_t *compound = type->compound;
 544
 545         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 546                 return compound->irtype;
 547         }
 548
 549         bool const is_union = type->base.kind == TYPE_COMPOUND_UNION;
 550
 551         symbol_t *type_symbol = compound->base.symbol;
 552         ident    *id;
 553         if (type_symbol != NULL) {
 554                 id = new_id_from_str(type_symbol->string);
 555         } else {
 556                 if (is_union) {
 557                         id = id_unique("__anonymous_union.%u");
 558                 } else {
 559                         id = id_unique("__anonymous_struct.%u");
 560                 }
 561         }
 562
 563         ir_type *irtype;
 564         if (is_union) {
 565                 irtype = new_type_union(id);
 566         } else {
 567                 irtype = new_type_struct(id);
 568         }
 569
 570         compound->irtype_complete = false;
 571         compound->irtype          = irtype;
 572
 573         if (incomplete)
 574                 return irtype;
 575
 576         if (is_union) {
 577                 layout_union_type(type);
 578         } else {
 579                 layout_struct_type(type);
 580         }
 581
 582         compound->irtype_complete = true;
 583
 584         entity_t *entry = compound->members.entities;
 585         for ( ; entry != NULL; entry = entry->base.next) {
 586                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 587                         continue;
 588
 589                 symbol_t *symbol     = entry->base.symbol;
 590                 type_t   *entry_type = entry->declaration.type;
 591                 ident    *ident;
 592                 if (symbol == NULL) {
 593                         /* anonymous bitfield member, skip */
 594                         if (entry->compound_member.bitfield)
 595                                 continue;
 596                         assert(is_type_compound(entry_type));
 597                         ident = id_unique("anon.%u");
 598                 } else {
 599                         ident = new_id_from_str(symbol->string);
 600                 }
 601
 602                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 603
 604                 ir_type *entry_irtype;
 605                 if (entry->compound_member.bitfield) {
 606                         entry_irtype = create_bitfield_type(entry);
 607                 } else {
 608                         entry_irtype = get_ir_type(entry_type);
 609                 }
 610                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 611
 612                 set_entity_offset(entity, entry->compound_member.offset);
 613                 set_entity_offset_bits_remainder(entity,
 614                                                  entry->compound_member.bit_offset);
 615
 616                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 617                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 618                 entry->compound_member.entity = entity;
 619         }
 620
 621         set_type_alignment_bytes(irtype, compound->alignment);
 622         set_type_size_bytes(irtype, compound->size);
 623         set_type_state(irtype, layout_fixed);
 624
 625         return irtype;
 626 }
 627
 628 void determine_enum_values(enum_type_t *const type)
 629 {
 630         ir_mode   *const mode    = atomic_modes[type->base.akind];
 631         ir_tarval *const one     = get_mode_one(mode);
 632         ir_tarval *      tv_next = get_mode_null(mode);
 633
 634         enum_t   *enume = type->enume;
 635         entity_t *entry = enume->base.next;
 636         for (; entry != NULL; entry = entry->base.next) {
 637                 if (entry->kind != ENTITY_ENUM_VALUE)
 638                         break;
 639
 640                 expression_t *const init = entry->enum_value.value;
 641                 if (init != NULL) {
 642                         tv_next = fold_constant_to_tarval(init);
 643                 }
 644                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 645                 entry->enum_value.tv = tv_next;
 646                 tv_next = tarval_add(tv_next, one);
 647         }
 648 }
 649
 650 static ir_type *create_enum_type(enum_type_t *const type)
 651 {
 652         return create_atomic_type(type->base.akind, (const type_t*) type);
 653 }
 654
 655 static ir_type *get_ir_type_incomplete(type_t *type)
 656 {
 657         type = skip_typeref(type);
 658
 659         if (type->base.firm_type != NULL) {
 660                 return type->base.firm_type;
 661         }
 662
 663         if (is_type_compound(type)) {
 664                 return create_compound_type(&type->compound, true);
 665         } else {
 666                 return get_ir_type(type);
 667         }
 668 }
 669
 670 ir_type *get_ir_type(type_t *type)
 671 {
 672         type = skip_typeref(type);
 673
 674         if (type->base.firm_type != NULL) {
 675                 return type->base.firm_type;
 676         }
 677
 678         ir_type *firm_type = NULL;
 679         switch (type->kind) {
 680         case TYPE_ATOMIC:
 681                 firm_type = create_atomic_type(type->atomic.akind, type);
 682                 break;
 683         case TYPE_COMPLEX:
 684                 firm_type = create_complex_type(&type->atomic);
 685                 break;
 686         case TYPE_IMAGINARY:
 687                 firm_type = create_imaginary_type(&type->atomic);
 688                 break;
 689         case TYPE_FUNCTION:
 690                 firm_type = create_method_type(&type->function, false);
 691                 break;
 692         case TYPE_POINTER:
 693                 firm_type = create_pointer_type(&type->pointer);
 694                 break;
 695         case TYPE_REFERENCE:
 696                 firm_type = create_reference_type(&type->reference);
 697                 break;
 698         case TYPE_ARRAY:
 699                 firm_type = create_array_type(&type->array);
 700                 break;
 701         case TYPE_COMPOUND_STRUCT:
 702         case TYPE_COMPOUND_UNION:
 703                 firm_type = create_compound_type(&type->compound, false);
 704                 break;
 705         case TYPE_ENUM:
 706                 firm_type = create_enum_type(&type->enumt);
 707                 break;
 708
 709         case TYPE_ERROR:
 710         case TYPE_TYPEOF:
 711         case TYPE_TYPEDEF:
 712                 break;
 713         }
 714         if (firm_type == NULL)
 715                 panic("unknown type found");
 716
 717         type->base.firm_type = firm_type;
 718         return firm_type;
 719 }
 720
 721 static ir_mode *get_ir_mode_storage(type_t *type)
 722 {
 723         type = skip_typeref(type);
 724
 725         /* Firm doesn't report a mode for arrays and structs/unions. */
 726         if (!is_type_scalar(type)) {
 727                 return mode_P_data;
 728         }
 729
 730         ir_type *const irtype = get_ir_type(type);
 731         ir_mode *const mode   = get_type_mode(irtype);
 732         assert(mode != NULL);
 733         return mode;
 734 }
 735
 736 /*
 737  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 738  * int that it returns bigger modes for floating point on some platforms
 739  * (x87 internally does arithemtic with 80bits)
 740  */
 741 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 742 {
 743         ir_mode *mode = get_ir_mode_storage(type);
 744         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 745                 return mode_float_arithmetic;
 746         }
 747
 748         return mode;
 749 }
 750
 751 /**
 752  * Return a node representing the size of a type.
 753  */
 754 static ir_node *get_type_size_node(type_t *type)
 755 {
 756         unsigned size;
 757         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 758         type = skip_typeref(type);
 759
 760         if (is_type_array(type) && type->array.is_vla) {
 761                 ir_node *size_node = get_vla_size(&type->array);
 762                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 763                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 764                 return real_size;
 765         }
 766
 767         size = get_type_size(type);
 768         return new_Const_long(mode, size);
 769 }
 770
 771 /** Names of the runtime functions. */
 772 static const struct {
 773         int        id;           /**< the rts id */
 774         int        n_res;        /**< number of return values */
 775         const char *name;        /**< the name of the rts function */
 776         int        n_params;     /**< number of parameters */
 777         unsigned   flags;        /**< language flags */
 778 } rts_data[] = {
 779         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 780         { rts_abort,      0, "abort",        0, _C89 },
 781         { rts_alloca,     1, "alloca",       1, _ALL },
 782         { rts_abs,        1, "abs",          1, _C89 },
 783         { rts_labs,       1, "labs",         1, _C89 },
 784         { rts_llabs,      1, "llabs",        1, _C99 },
 785         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 786
 787         { rts_fabs,       1, "fabs",         1, _C89 },
 788         { rts_sqrt,       1, "sqrt",         1, _C89 },
 789         { rts_cbrt,       1, "cbrt",         1, _C99 },
 790         { rts_exp,        1, "exp",          1, _C89 },
 791         { rts_exp2,       1, "exp2",         1, _C89 },
 792         { rts_exp10,      1, "exp10",        1, _GNUC },
 793         { rts_log,        1, "log",          1, _C89 },
 794         { rts_log2,       1, "log2",         1, _C89 },
 795         { rts_log10,      1, "log10",        1, _C89 },
 796         { rts_pow,        1, "pow",          2, _C89 },
 797         { rts_sin,        1, "sin",          1, _C89 },
 798         { rts_cos,        1, "cos",          1, _C89 },
 799         { rts_tan,        1, "tan",          1, _C89 },
 800         { rts_asin,       1, "asin",         1, _C89 },
 801         { rts_acos,       1, "acos",         1, _C89 },
 802         { rts_atan,       1, "atan",         1, _C89 },
 803         { rts_sinh,       1, "sinh",         1, _C89 },
 804         { rts_cosh,       1, "cosh",         1, _C89 },
 805         { rts_tanh,       1, "tanh",         1, _C89 },
 806
 807         { rts_fabsf,      1, "fabsf",        1, _C99 },
 808         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 809         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 810         { rts_expf,       1, "expf",         1, _C99 },
 811         { rts_exp2f,      1, "exp2f",        1, _C99 },
 812         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 813         { rts_logf,       1, "logf",         1, _C99 },
 814         { rts_log2f,      1, "log2f",        1, _C99 },
 815         { rts_log10f,     1, "log10f",       1, _C99 },
 816         { rts_powf,       1, "powf",         2, _C99 },
 817         { rts_sinf,       1, "sinf",         1, _C99 },
 818         { rts_cosf,       1, "cosf",         1, _C99 },
 819         { rts_tanf,       1, "tanf",         1, _C99 },
 820         { rts_asinf,      1, "asinf",        1, _C99 },
 821         { rts_acosf,      1, "acosf",        1, _C99 },
 822         { rts_atanf,      1, "atanf",        1, _C99 },
 823         { rts_sinhf,      1, "sinhf",        1, _C99 },
 824         { rts_coshf,      1, "coshf",        1, _C99 },
 825         { rts_tanhf,      1, "tanhf",        1, _C99 },
 826
 827         { rts_fabsl,      1, "fabsl",        1, _C99 },
 828         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 829         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 830         { rts_expl,       1, "expl",         1, _C99 },
 831         { rts_exp2l,      1, "exp2l",        1, _C99 },
 832         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 833         { rts_logl,       1, "logl",         1, _C99 },
 834         { rts_log2l,      1, "log2l",        1, _C99 },
 835         { rts_log10l,     1, "log10l",       1, _C99 },
 836         { rts_powl,       1, "powl",         2, _C99 },
 837         { rts_sinl,       1, "sinl",         1, _C99 },
 838         { rts_cosl,       1, "cosl",         1, _C99 },
 839         { rts_tanl,       1, "tanl",         1, _C99 },
 840         { rts_asinl,      1, "asinl",        1, _C99 },
 841         { rts_acosl,      1, "acosl",        1, _C99 },
 842         { rts_atanl,      1, "atanl",        1, _C99 },
 843         { rts_sinhl,      1, "sinhl",        1, _C99 },
 844         { rts_coshl,      1, "coshl",        1, _C99 },
 845         { rts_tanhl,      1, "tanhl",        1, _C99 },
 846
 847         { rts_strcmp,     1, "strcmp",       2, _C89 },
 848         { rts_strncmp,    1, "strncmp",      3, _C89 },
 849         { rts_strcpy,     1, "strcpy",       2, _C89 },
 850         { rts_strlen,     1, "strlen",       1, _C89 },
 851         { rts_memcpy,     1, "memcpy",       3, _C89 },
 852         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 853         { rts_memmove,    1, "memmove",      3, _C89 },
 854         { rts_memset,     1, "memset",       3, _C89 },
 855         { rts_memcmp,     1, "memcmp",       3, _C89 },
 856 };
 857
 858 static ident *rts_idents[lengthof(rts_data)];
 859
 860 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 861
 862 void set_create_ld_ident(ident *(*func)(entity_t*))
 863 {
 864         create_ld_ident = func;
 865 }
 866
 867 static bool declaration_is_definition(const entity_t *entity)
 868 {
 869         switch (entity->kind) {
 870         case ENTITY_VARIABLE:
 871                 return entity->declaration.storage_class != STORAGE_CLASS_EXTERN;
 872         case ENTITY_FUNCTION:
 873                 return entity->function.body != NULL;
 874         case ENTITY_PARAMETER:
 875         case ENTITY_COMPOUND_MEMBER:
 876                 return false;
 877         case ENTITY_TYPEDEF:
 878         case ENTITY_ENUM:
 879         case ENTITY_ENUM_VALUE:
 880         case ENTITY_NAMESPACE:
 881         case ENTITY_LABEL:
 882         case ENTITY_LOCAL_LABEL:
 883                 break;
 884         }
 885         panic("declaration_is_definition called on non-declaration");
 886 }
 887
 888 /**
 889  * Handle GNU attributes for entities
 890  *
 891  * @param ent   the entity
 892  * @param decl  the routine declaration
 893  */
 894 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 895 {
 896         assert(is_declaration(entity));
 897         decl_modifiers_t modifiers = entity->declaration.modifiers;
 898
 899         if (is_method_entity(irentity)) {
 900                 if (modifiers & DM_PURE)
 901                         add_entity_additional_properties(irentity, mtp_property_pure);
 902                 if (modifiers & DM_CONST)
 903                         add_entity_additional_properties(irentity, mtp_property_const);
 904                 if (modifiers & DM_NOINLINE)
 905                         add_entity_additional_properties(irentity, mtp_property_noinline);
 906                 if (modifiers & DM_FORCEINLINE)
 907                         add_entity_additional_properties(irentity, mtp_property_always_inline);
 908                 if (modifiers & DM_NAKED)
 909                         add_entity_additional_properties(irentity, mtp_property_naked);
 910                 if (entity->kind == ENTITY_FUNCTION && entity->function.is_inline)
 911                         add_entity_additional_properties(irentity,
 912                                                                                          mtp_property_inline_recommended);
 913         }
 914         if ((modifiers & DM_USED) && declaration_is_definition(entity)) {
 915                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 916         }
 917         if ((modifiers & DM_WEAK) && declaration_is_definition(entity)
 918             && entity->declaration.storage_class != STORAGE_CLASS_EXTERN) {
 919                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 920         }
 921 }
 922
 923 static bool is_main(entity_t *entity)
 924 {
 925         static symbol_t *sym_main = NULL;
 926         if (sym_main == NULL) {
 927                 sym_main = symbol_table_insert("main");
 928         }
 929
 930         if (entity->base.symbol != sym_main)
 931                 return false;
 932         /* must be in outermost scope */
 933         if (entity->base.parent_scope != &current_translation_unit->scope)
 934                 return false;
 935
 936         return true;
 937 }
 938
 939 /**
 940  * Creates an entity representing a function.
 941  *
 942  * @param entity       the function declaration/definition
 943  * @param owner_type   the owner type of this function, NULL
 944  *                     for global functions
 945  */
 946 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 947 {
 948         assert(entity->kind == ENTITY_FUNCTION);
 949         if (entity->function.irentity != NULL)
 950                 return entity->function.irentity;
 951
 952         switch (entity->function.btk) {
 953         case BUILTIN_NONE:
 954         case BUILTIN_LIBC:
 955         case BUILTIN_LIBC_CHECK:
 956                 break;
 957         default:
 958                 return NULL;
 959         }
 960
 961         symbol_t *symbol = entity->base.symbol;
 962         ident    *id     = new_id_from_str(symbol->string);
 963
 964         /* already an entity defined? */
 965         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 966         bool const has_body = entity->function.body != NULL;
 967         if (irentity != NULL) {
 968                 goto entity_created;
 969         }
 970
 971         ir_type *ir_type_method;
 972         if (entity->function.need_closure)
 973                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 974         else
 975                 ir_type_method = get_ir_type(entity->declaration.type);
 976
 977         bool nested_function = false;
 978         if (owner_type == NULL)
 979                 owner_type = get_glob_type();
 980         else
 981                 nested_function = true;
 982
 983         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 984         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 985
 986         ident *ld_id;
 987         if (nested_function)
 988                 ld_id = id_unique("inner.%u");
 989         else
 990                 ld_id = create_ld_ident(entity);
 991         set_entity_ld_ident(irentity, ld_id);
 992
 993         handle_decl_modifiers(irentity, entity);
 994
 995         if (! nested_function) {
 996                 storage_class_tag_t const storage_class
 997                         = (storage_class_tag_t) entity->declaration.storage_class;
 998                 if (storage_class == STORAGE_CLASS_STATIC) {
 999                     set_entity_visibility(irentity, ir_visibility_local);
1000                 } else {
1001                     set_entity_visibility(irentity, ir_visibility_external);
1002                 }
1003
1004                 bool const is_inline = entity->function.is_inline;
1005                 if (is_inline && has_body) {
1006                         if (((c_mode & _C99) && storage_class == STORAGE_CLASS_NONE)
1007                             || ((c_mode & _C99) == 0
1008                                 && storage_class == STORAGE_CLASS_EXTERN)) {
1009                                 add_entity_linkage(irentity, IR_LINKAGE_NO_CODEGEN);
1010                         }
1011                 }
1012         } else {
1013                 /* nested functions are always local */
1014                 set_entity_visibility(irentity, ir_visibility_local);
1015         }
1016
1017         /* We should check for file scope here, but as long as we compile C only
1018            this is not needed. */
1019         if (!freestanding && !has_body) {
1020                 /* check for a known runtime function */
1021                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1022                         if (id != rts_idents[i])
1023                                 continue;
1024
1025                         function_type_t *function_type
1026                                 = &entity->declaration.type->function;
1027                         /* rts_entities code can't handle a "wrong" number of parameters */
1028                         if (function_type->unspecified_parameters)
1029                                 continue;
1030
1031                         /* check number of parameters */
1032                         int n_params = count_parameters(function_type);
1033                         if (n_params != rts_data[i].n_params)
1034                                 continue;
1035
1036                         type_t *return_type = skip_typeref(function_type->return_type);
1037                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1038                         if (n_res != rts_data[i].n_res)
1039                                 continue;
1040
1041                         /* ignore those rts functions not necessary needed for current mode */
1042                         if ((c_mode & rts_data[i].flags) == 0)
1043                                 continue;
1044                         assert(rts_entities[rts_data[i].id] == NULL);
1045                         rts_entities[rts_data[i].id] = irentity;
1046                 }
1047         }
1048
1049         entitymap_insert(&entitymap, symbol, irentity);
1050
1051 entity_created:
1052         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1053         entity->function.irentity = irentity;
1054
1055         return irentity;
1056 }
1057
1058 /**
1059  * Creates a SymConst for a given entity.
1060  *
1061  * @param dbgi    debug info
1062  * @param entity  the entity
1063  */
1064 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1065 {
1066         assert(entity != NULL);
1067         union symconst_symbol sym;
1068         sym.entity_p = entity;
1069         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1070 }
1071
1072 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1073 {
1074         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1075 }
1076
1077 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1078                                    ir_mode *dest_mode)
1079 {
1080         if (is_Const(value)) {
1081                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1082         }
1083
1084         ir_node *cond       = new_d_Cond(dbgi, value);
1085         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1086         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1087         ir_node *tblock     = new_Block(1, &proj_true);
1088         ir_node *fblock     = new_Block(1, &proj_false);
1089         set_cur_block(tblock);
1090         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1091         ir_node *tjump  = new_Jmp();
1092         set_cur_block(fblock);
1093         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1094         ir_node *fjump  = new_Jmp();
1095
1096         ir_node *in[2]      = { tjump, fjump };
1097         ir_node *mergeblock = new_Block(2, in);
1098         set_cur_block(mergeblock);
1099         ir_node *phi_in[2]  = { const1, const0 };
1100         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1101         return phi;
1102 }
1103
1104 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1105 {
1106         ir_mode *value_mode = get_irn_mode(value);
1107
1108         if (value_mode == dest_mode)
1109                 return value;
1110
1111         if (dest_mode == mode_b) {
1112                 ir_node *zero = new_Const(get_mode_null(value_mode));
1113                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1114                 return cmp;
1115         } else if (value_mode == mode_b) {
1116                 return create_conv_from_b(dbgi, value, dest_mode);
1117         }
1118
1119         return new_d_Conv(dbgi, value, dest_mode);
1120 }
1121
1122 /**
1123  * Creates a SymConst node representing a string constant.
1124  *
1125  * @param src_pos    the source position of the string constant
1126  * @param id_prefix  a prefix for the name of the generated string constant
1127  * @param value      the value of the string constant
1128  */
1129 static ir_node *string_to_firm(source_position_t const *const src_pos, char const *const id_prefix, string_t const *const value)
1130 {
1131         size_t            const slen        = get_string_len(value) + 1;
1132         ir_initializer_t *const initializer = create_initializer_compound(slen);
1133         ir_type          *      elem_type;
1134         switch (value->encoding) {
1135         case STRING_ENCODING_CHAR: {
1136                 elem_type = ir_type_char;
1137
1138                 ir_mode *const mode = get_type_mode(elem_type);
1139                 char const    *p    = value->begin;
1140                 for (size_t i = 0; i < slen; ++i) {
1141                         ir_tarval        *tv  = new_tarval_from_long(*p++, mode);
1142                         ir_initializer_t *val = create_initializer_tarval(tv);
1143                         set_initializer_compound_value(initializer, i, val);
1144                 }
1145                 goto finish;
1146         }
1147
1148         case STRING_ENCODING_WIDE: {
1149                 elem_type = ir_type_wchar_t;
1150
1151                 ir_mode *const mode = get_type_mode(elem_type);
1152                 char const    *p    = value->begin;
1153                 for (size_t i = 0; i < slen; ++i) {
1154                         assert(p <= value->begin + value->size);
1155                         utf32             v   = read_utf8_char(&p);
1156                         ir_tarval        *tv  = new_tarval_from_long(v, mode);
1157                         ir_initializer_t *val = create_initializer_tarval(tv);
1158                         set_initializer_compound_value(initializer, i, val);
1159                 }
1160                 goto finish;
1161         }
1162         }
1163         panic("invalid string encoding");
1164
1165 finish:;
1166         ir_type *const type = new_type_array(1, elem_type);
1167         set_array_bounds_int(type, 0, 0, slen);
1168         set_type_size_bytes( type, slen * get_type_size_bytes(elem_type));
1169         set_type_state(      type, layout_fixed);
1170
1171         ir_type   *const global_type = get_glob_type();
1172         ident     *const id          = id_unique(id_prefix);
1173         dbg_info  *const dbgi        = get_dbg_info(src_pos);
1174         ir_entity *const entity      = new_d_entity(global_type, id, type, dbgi);
1175         set_entity_ld_ident(   entity, id);
1176         set_entity_visibility( entity, ir_visibility_private);
1177         add_entity_linkage(    entity, IR_LINKAGE_CONSTANT);
1178         set_entity_initializer(entity, initializer);
1179
1180         return create_symconst(dbgi, entity);
1181 }
1182
1183 static bool try_create_integer(literal_expression_t *literal, type_t *type)
1184 {
1185         assert(type->kind == TYPE_ATOMIC);
1186         atomic_type_kind_t akind = type->atomic.akind;
1187
1188         ir_mode    *const mode = atomic_modes[akind];
1189         char const *const str  = literal->value.begin;
1190         ir_tarval  *const tv   = new_tarval_from_str(str, literal->suffix - str, mode);
1191         if (tv == tarval_bad)
1192                 return false;
1193
1194         literal->base.type    = type;
1195         literal->target_value = tv;
1196         return true;
1197 }
1198
1199 void determine_literal_type(literal_expression_t *const literal)
1200 {
1201         assert(literal->base.kind == EXPR_LITERAL_INTEGER);
1202
1203         /* -1: signed only, 0: any, 1: unsigned only */
1204         int const sign =
1205                 !is_type_signed(literal->base.type) ? 1 :
1206                 literal->value.begin[0] == '0'      ? 0 :
1207                 -1; /* Decimal literals only try signed types. */
1208
1209         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1210         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1211
1212         if (try_create_integer(literal, literal->base.type))
1213                 goto finished;
1214
1215         /* now try if the constant is small enough for some types */
1216         if (sign >= 0 && try_create_integer(literal, type_unsigned_int))
1217                 goto finished;
1218         if (sign <= 0 && try_create_integer(literal, type_long))
1219                 goto finished;
1220         if (sign >= 0 && try_create_integer(literal, type_unsigned_long))
1221                 goto finished;
1222         /* last try? then we should not report tarval_bad */
1223         if (sign < 0)
1224                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1225         if (sign <= 0 && try_create_integer(literal, type_long_long))
1226                 goto finished;
1227
1228         /* last try */
1229         assert(sign >= 0);
1230         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1231         bool res = try_create_integer(literal, type_unsigned_long_long);
1232         if (!res)
1233                 panic("internal error when parsing number literal");
1234
1235 finished:
1236         tarval_set_integer_overflow_mode(old_mode);
1237 }
1238
1239 /**
1240  * Creates a Const node representing a constant.
1241  */
1242 static ir_node *literal_to_firm(const literal_expression_t *literal)
1243 {
1244         type_t     *type   = skip_typeref(literal->base.type);
1245         ir_mode    *mode   = get_ir_mode_storage(type);
1246         const char *string = literal->value.begin;
1247         size_t      size   = literal->value.size;
1248         ir_tarval  *tv;
1249
1250         switch (literal->base.kind) {
1251         case EXPR_LITERAL_INTEGER:
1252                 assert(literal->target_value != NULL);
1253                 tv = literal->target_value;
1254                 break;
1255
1256         case EXPR_LITERAL_FLOATINGPOINT:
1257                 tv = new_tarval_from_str(string, size, mode);
1258                 break;
1259
1260         case EXPR_LITERAL_BOOLEAN:
1261                 if (string[0] == 't') {
1262                         tv = get_mode_one(mode);
1263                 } else {
1264                         assert(string[0] == 'f');
1265         case EXPR_LITERAL_MS_NOOP:
1266                         tv = get_mode_null(mode);
1267                 }
1268                 break;
1269
1270         default:
1271                 panic("Invalid literal kind found");
1272         }
1273
1274         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1275         ir_node  *res        = new_d_Const(dbgi, tv);
1276         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1277         return create_conv(dbgi, res, mode_arith);
1278 }
1279
1280 /**
1281  * Creates a Const node representing a character constant.
1282  */
1283 static ir_node *char_literal_to_firm(string_literal_expression_t const *literal)
1284 {
1285         type_t     *type   = skip_typeref(literal->base.type);
1286         ir_mode    *mode   = get_ir_mode_storage(type);
1287         const char *string = literal->value.begin;
1288         size_t      size   = literal->value.size;
1289         ir_tarval  *tv;
1290
1291         switch (literal->value.encoding) {
1292         case STRING_ENCODING_WIDE: {
1293                 utf32  v = read_utf8_char(&string);
1294                 char   buf[128];
1295                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1296
1297                 tv = new_tarval_from_str(buf, len, mode);
1298                 break;
1299         }
1300
1301         case STRING_ENCODING_CHAR: {
1302                 long long int v;
1303                 bool char_is_signed
1304                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1305                 if (size == 1 && char_is_signed) {
1306                         v = (signed char)string[0];
1307                 } else {
1308                         v = 0;
1309                         for (size_t i = 0; i < size; ++i) {
1310                                 v = (v << 8) | ((unsigned char)string[i]);
1311                         }
1312                 }
1313                 char   buf[128];
1314                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1315
1316                 tv = new_tarval_from_str(buf, len, mode);
1317                 break;
1318         }
1319
1320         default:
1321                 panic("Invalid literal kind found");
1322         }
1323
1324         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1325         ir_node  *res        = new_d_Const(dbgi, tv);
1326         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1327         return create_conv(dbgi, res, mode_arith);
1328 }
1329
1330 /*
1331  * Allocate an area of size bytes aligned at alignment
1332  * at a frame type.
1333  */
1334 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1335 {
1336         static unsigned area_cnt = 0;
1337         char buf[32];
1338
1339         ir_type *tp = new_type_array(1, ir_type_char);
1340         set_array_bounds_int(tp, 0, 0, size);
1341         set_type_alignment_bytes(tp, alignment);
1342
1343         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1344         ident *name = new_id_from_str(buf);
1345         ir_entity *area = new_entity(frame_type, name, tp);
1346
1347         /* mark this entity as compiler generated */
1348         set_entity_compiler_generated(area, 1);
1349         return area;
1350 }
1351
1352 /**
1353  * Return a node representing a trampoline region
1354  * for a given function entity.
1355  *
1356  * @param dbgi    debug info
1357  * @param entity  the function entity
1358  */
1359 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1360 {
1361         ir_entity *region = NULL;
1362         int        i;
1363
1364         if (current_trampolines != NULL) {
1365                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1366                         if (current_trampolines[i].function == entity) {
1367                                 region = current_trampolines[i].region;
1368                                 break;
1369                         }
1370                 }
1371         } else {
1372                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1373         }
1374         ir_graph *irg = current_ir_graph;
1375         if (region == NULL) {
1376                 /* create a new region */
1377                 ir_type           *frame_tp = get_irg_frame_type(irg);
1378                 trampoline_region  reg;
1379                 reg.function = entity;
1380
1381                 reg.region   = alloc_trampoline(frame_tp,
1382                                                 be_params->trampoline_size,
1383                                                 be_params->trampoline_align);
1384                 ARR_APP1(trampoline_region, current_trampolines, reg);
1385                 region = reg.region;
1386         }
1387         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1388                                region);
1389 }
1390
1391 /**
1392  * Creates a trampoline for a function represented by an entity.
1393  *
1394  * @param dbgi    debug info
1395  * @param mode    the (reference) mode for the function address
1396  * @param entity  the function entity
1397  */
1398 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1399                                   ir_entity *entity)
1400 {
1401         assert(entity != NULL);
1402         ir_node *in[3];
1403         in[0] = get_trampoline_region(dbgi, entity);
1404         in[1] = create_symconst(dbgi, entity);
1405         in[2] = get_irg_frame(current_ir_graph);
1406
1407         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1408         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1409         return new_Proj(irn, mode, pn_Builtin_max+1);
1410 }
1411
1412 /**
1413  * Dereference an address.
1414  *
1415  * @param dbgi  debug info
1416  * @param type  the type of the dereferenced result (the points_to type)
1417  * @param addr  the address to dereference
1418  */
1419 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1420                                       ir_node *const addr)
1421 {
1422         type_t *skipped = skip_typeref(type);
1423         if (is_type_incomplete(skipped))
1424                 return addr;
1425
1426         ir_type *irtype = get_ir_type(skipped);
1427         if (is_compound_type(irtype)
1428             || is_Method_type(irtype)
1429             || is_Array_type(irtype)) {
1430                 return addr;
1431         }
1432
1433         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1434                                   ? cons_volatile : cons_none;
1435         ir_mode *const mode     = get_type_mode(irtype);
1436         ir_node *const memory   = get_store();
1437         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1438         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1439         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1440
1441         set_store(load_mem);
1442
1443         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1444         return create_conv(dbgi, load_res, mode_arithmetic);
1445 }
1446
1447 /**
1448  * Returns the correct base address depending on whether it is a parameter or a
1449  * normal local variable.
1450  */
1451 static ir_node *get_local_frame(ir_entity *const ent)
1452 {
1453         ir_graph      *const irg   = current_ir_graph;
1454         const ir_type *const owner = get_entity_owner(ent);
1455         if (owner == current_outer_frame) {
1456                 assert(current_static_link != NULL);
1457                 return current_static_link;
1458         } else {
1459                 return get_irg_frame(irg);
1460         }
1461 }
1462
1463 /**
1464  * Keep all memory edges of the given block.
1465  */
1466 static void keep_all_memory(ir_node *block)
1467 {
1468         ir_node *old = get_cur_block();
1469
1470         set_cur_block(block);
1471         keep_alive(get_store());
1472         /* TODO: keep all memory edges from restricted pointers */
1473         set_cur_block(old);
1474 }
1475
1476 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1477 {
1478         entity_t *entity = ref->entity;
1479         if (entity->enum_value.tv == NULL) {
1480                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1481                 assert(type->kind == TYPE_ENUM);
1482                 determine_enum_values(&type->enumt);
1483         }
1484
1485         return new_Const(entity->enum_value.tv);
1486 }
1487
1488 static ir_node *reference_addr(const reference_expression_t *ref)
1489 {
1490         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1491         entity_t *entity = ref->entity;
1492         assert(is_declaration(entity));
1493
1494         if (entity->kind == ENTITY_FUNCTION
1495             && entity->function.btk != BUILTIN_NONE) {
1496                 ir_entity *irentity = get_function_entity(entity, NULL);
1497                 /* for gcc compatibility we have to produce (dummy) addresses for some
1498                  * builtins which don't have entities */
1499                 if (irentity == NULL) {
1500                         source_position_t const *const pos = &ref->base.source_position;
1501                         warningf(WARN_OTHER, pos, "taking address of builtin '%N'", ref->entity);
1502
1503                         /* simply create a NULL pointer */
1504                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1505                         ir_node  *res  = new_Const(get_mode_null(mode));
1506
1507                         return res;
1508                 }
1509         }
1510
1511         switch((declaration_kind_t) entity->declaration.kind) {
1512         case DECLARATION_KIND_UNKNOWN:
1513                 break;
1514         case DECLARATION_KIND_PARAMETER:
1515         case DECLARATION_KIND_LOCAL_VARIABLE:
1516                 /* you can store to a local variable (so we don't panic but return NULL
1517                  * as an indicator for no real address) */
1518                 return NULL;
1519         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1520                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1521                 return addr;
1522         }
1523
1524         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
1525         case DECLARATION_KIND_PARAMETER_ENTITY: {
1526                 ir_entity *irentity = entity->variable.v.entity;
1527                 ir_node   *frame    = get_local_frame(irentity);
1528                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1529                 return sel;
1530         }
1531
1532         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1533                 return entity->variable.v.vla_base;
1534
1535         case DECLARATION_KIND_FUNCTION: {
1536                 return create_symconst(dbgi, entity->function.irentity);
1537         }
1538
1539         case DECLARATION_KIND_INNER_FUNCTION: {
1540                 type_t  *const type = skip_typeref(entity->declaration.type);
1541                 ir_mode *const mode = get_ir_mode_storage(type);
1542                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1543                         /* inner function not using the closure */
1544                         return create_symconst(dbgi, entity->function.irentity);
1545                 } else {
1546                         /* need trampoline here */
1547                         return create_trampoline(dbgi, mode, entity->function.irentity);
1548                 }
1549         }
1550
1551         case DECLARATION_KIND_COMPOUND_MEMBER:
1552                 panic("not implemented reference type");
1553         }
1554
1555         panic("reference to declaration with unknown type found");
1556 }
1557
1558 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1559 {
1560         dbg_info *const dbgi   = get_dbg_info(&ref->base.source_position);
1561         entity_t *const entity = ref->entity;
1562         assert(is_declaration(entity));
1563
1564         switch ((declaration_kind_t)entity->declaration.kind) {
1565         case DECLARATION_KIND_LOCAL_VARIABLE:
1566         case DECLARATION_KIND_PARAMETER: {
1567                 type_t  *const type  = skip_typeref(entity->declaration.type);
1568                 ir_mode *const mode  = get_ir_mode_storage(type);
1569                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1570                 return create_conv(dbgi, value, get_ir_mode_arithmetic(type));
1571         }
1572
1573         default: {
1574                 ir_node *const addr = reference_addr(ref);
1575                 return deref_address(dbgi, entity->declaration.type, addr);
1576         }
1577         }
1578 }
1579
1580 /**
1581  * Transform calls to builtin functions.
1582  */
1583 static ir_node *process_builtin_call(const call_expression_t *call)
1584 {
1585         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1586
1587         assert(call->function->kind == EXPR_REFERENCE);
1588         reference_expression_t *builtin = &call->function->reference;
1589
1590         type_t *expr_type = skip_typeref(builtin->base.type);
1591         assert(is_type_pointer(expr_type));
1592
1593         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1594
1595         switch (builtin->entity->function.btk) {
1596         case BUILTIN_NONE:
1597                 break;
1598         case BUILTIN_ALLOCA: {
1599                 expression_t *argument = call->arguments->expression;
1600                 ir_node      *size     = expression_to_firm(argument);
1601
1602                 ir_node *store  = get_store();
1603                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1604                                               stack_alloc);
1605                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1606                 set_store(proj_m);
1607                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1608
1609                 return res;
1610         }
1611         case BUILTIN_INF: {
1612                 type_t    *type = function_type->function.return_type;
1613                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1614                 ir_tarval *tv   = get_mode_infinite(mode);
1615                 ir_node   *res  = new_d_Const(dbgi, tv);
1616                 return res;
1617         }
1618         case BUILTIN_NAN: {
1619                 /* Ignore string for now... */
1620                 assert(is_type_function(function_type));
1621                 type_t    *type = function_type->function.return_type;
1622                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1623                 ir_tarval *tv   = get_mode_NAN(mode);
1624                 ir_node   *res  = new_d_Const(dbgi, tv);
1625                 return res;
1626         }
1627         case BUILTIN_EXPECT: {
1628                 expression_t *argument = call->arguments->expression;
1629                 return _expression_to_firm(argument);
1630         }
1631         case BUILTIN_VA_END:
1632                 /* evaluate the argument of va_end for its side effects */
1633                 _expression_to_firm(call->arguments->expression);
1634                 return NULL;
1635         case BUILTIN_OBJECT_SIZE: {
1636                 /* determine value of "type" */
1637                 expression_t *type_expression = call->arguments->next->expression;
1638                 long          type_val        = fold_constant_to_int(type_expression);
1639                 type_t       *type            = function_type->function.return_type;
1640                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1641                 /* just produce a "I don't know" result */
1642                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1643                                                 get_mode_minus_one(mode);
1644
1645                 return new_d_Const(dbgi, result);
1646         }
1647         case BUILTIN_ROTL: {
1648                 ir_node *val  = expression_to_firm(call->arguments->expression);
1649                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1650                 ir_mode *mode = get_irn_mode(val);
1651                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1652                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1653         }
1654         case BUILTIN_ROTR: {
1655                 ir_node *val  = expression_to_firm(call->arguments->expression);
1656                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1657                 ir_mode *mode = get_irn_mode(val);
1658                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1659                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1660                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1661                 return new_d_Rotl(dbgi, val, sub, mode);
1662         }
1663         case BUILTIN_FIRM:
1664                 break;
1665         case BUILTIN_LIBC:
1666         case BUILTIN_LIBC_CHECK:
1667                 panic("builtin did not produce an entity");
1668         }
1669         panic("invalid builtin found");
1670 }
1671
1672 /**
1673  * Transform a call expression.
1674  * Handles some special cases, like alloca() calls, which must be resolved
1675  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1676  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1677  * handled right...
1678  */
1679 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1680 {
1681         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1682         assert(currently_reachable());
1683
1684         expression_t   *function = call->function;
1685         ir_node        *callee   = NULL;
1686         bool            firm_builtin = false;
1687         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1688         if (function->kind == EXPR_REFERENCE) {
1689                 const reference_expression_t *ref    = &function->reference;
1690                 entity_t                     *entity = ref->entity;
1691
1692                 if (entity->kind == ENTITY_FUNCTION) {
1693                         builtin_kind_t builtin = entity->function.btk;
1694                         if (builtin == BUILTIN_FIRM) {
1695                                 firm_builtin = true;
1696                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1697                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1698                                    && builtin != BUILTIN_LIBC_CHECK) {
1699                                 return process_builtin_call(call);
1700                         }
1701                 }
1702         }
1703         if (!firm_builtin)
1704                 callee = expression_to_firm(function);
1705
1706         type_t *type = skip_typeref(function->base.type);
1707         assert(is_type_pointer(type));
1708         pointer_type_t *pointer_type = &type->pointer;
1709         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1710         assert(is_type_function(points_to));
1711         function_type_t *function_type = &points_to->function;
1712
1713         int      n_parameters    = 0;
1714         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1715         ir_type *new_method_type = NULL;
1716         if (function_type->variadic || function_type->unspecified_parameters) {
1717                 const call_argument_t *argument = call->arguments;
1718                 for ( ; argument != NULL; argument = argument->next) {
1719                         ++n_parameters;
1720                 }
1721
1722                 /* we need to construct a new method type matching the call
1723                  * arguments... */
1724                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1725                 int n_res       = get_method_n_ress(ir_method_type);
1726                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1727                 set_method_calling_convention(new_method_type,
1728                                get_method_calling_convention(ir_method_type));
1729                 set_method_additional_properties(new_method_type,
1730                                get_method_additional_properties(ir_method_type));
1731                 set_method_variadicity(new_method_type,
1732                                        get_method_variadicity(ir_method_type));
1733
1734                 for (int i = 0; i < n_res; ++i) {
1735                         set_method_res_type(new_method_type, i,
1736                                             get_method_res_type(ir_method_type, i));
1737                 }
1738                 argument = call->arguments;
1739                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1740                         expression_t *expression = argument->expression;
1741                         ir_type      *irtype     = get_ir_type(expression->base.type);
1742                         set_method_param_type(new_method_type, i, irtype);
1743                 }
1744                 ir_method_type = new_method_type;
1745         } else {
1746                 n_parameters = get_method_n_params(ir_method_type);
1747         }
1748
1749         ir_node *in[n_parameters];
1750
1751         const call_argument_t *argument = call->arguments;
1752         for (int n = 0; n < n_parameters; ++n) {
1753                 expression_t *expression = argument->expression;
1754                 ir_node      *arg_node   = expression_to_firm(expression);
1755
1756                 type_t *arg_type = skip_typeref(expression->base.type);
1757                 if (!is_type_compound(arg_type)) {
1758                         ir_mode *const mode = get_ir_mode_storage(arg_type);
1759                         arg_node = create_conv(dbgi, arg_node, mode);
1760                 }
1761
1762                 in[n] = arg_node;
1763
1764                 argument = argument->next;
1765         }
1766
1767         ir_node *store;
1768         if (function_type->modifiers & DM_CONST) {
1769                 store = get_irg_no_mem(current_ir_graph);
1770         } else {
1771                 store = get_store();
1772         }
1773
1774         ir_node *node;
1775         type_t  *return_type = skip_typeref(function_type->return_type);
1776         ir_node *result      = NULL;
1777         if (firm_builtin) {
1778                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1779                                      ir_method_type);
1780                 if (! (function_type->modifiers & DM_CONST)) {
1781                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1782                         set_store(mem);
1783                 }
1784
1785                 if (!is_type_void(return_type)) {
1786                         assert(is_type_scalar(return_type));
1787                         ir_mode *mode = get_ir_mode_storage(return_type);
1788                         result = new_Proj(node, mode, pn_Builtin_max+1);
1789                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1790                         result              = create_conv(NULL, result, mode_arith);
1791                 }
1792         } else {
1793                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1794                 if (! (function_type->modifiers & DM_CONST)) {
1795                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1796                         set_store(mem);
1797                 }
1798
1799                 if (!is_type_void(return_type)) {
1800                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1801                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1802                         result                    = new_Proj(resproj, mode, 0);
1803                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1804                         result                    = create_conv(NULL, result, mode_arith);
1805                 }
1806         }
1807
1808         if (function_type->modifiers & DM_NORETURN) {
1809                 /* A dead end:  Keep the Call and the Block.  Also place all further
1810                  * nodes into a new and unreachable block. */
1811                 keep_alive(node);
1812                 keep_alive(get_cur_block());
1813                 ir_node *block = new_Block(0, NULL);
1814                 set_cur_block(block);
1815         }
1816
1817         return result;
1818 }
1819
1820 static ir_node *statement_to_firm(statement_t *statement);
1821 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1822
1823 static ir_node *expression_to_addr(const expression_t *expression);
1824 static ir_node *create_condition_evaluation(const expression_t *expression,
1825                                             ir_node *true_block,
1826                                             ir_node *false_block);
1827
1828 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1829                          ir_node *value)
1830 {
1831         if (!is_type_compound(type)) {
1832                 ir_mode *mode = get_ir_mode_storage(type);
1833                 value         = create_conv(dbgi, value, mode);
1834         }
1835
1836         ir_node *memory = get_store();
1837
1838         if (is_type_scalar(type)) {
1839                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1840                                       ? cons_volatile : cons_none;
1841                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1842                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1843                 set_store(store_mem);
1844         } else {
1845                 ir_type *irtype    = get_ir_type(type);
1846                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1847                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1848                 set_store(copyb_mem);
1849         }
1850 }
1851
1852 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1853 {
1854         ir_tarval *all_one   = get_mode_all_one(mode);
1855         int        mode_size = get_mode_size_bits(mode);
1856         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1857
1858         assert(offset >= 0);
1859         assert(size   >= 0);
1860         assert(offset + size <= mode_size);
1861         if (size == mode_size) {
1862                 return all_one;
1863         }
1864
1865         long       shiftr    = get_mode_size_bits(mode) - size;
1866         long       shiftl    = offset;
1867         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1868         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1869         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1870         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1871
1872         return mask1;
1873 }
1874
1875 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1876                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1877                 bool need_return)
1878 {
1879         ir_type *entity_type = get_entity_type(entity);
1880         ir_type *base_type   = get_primitive_base_type(entity_type);
1881         ir_mode *mode        = get_type_mode(base_type);
1882         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1883
1884         value = create_conv(dbgi, value, mode);
1885
1886         /* kill upper bits of value and shift to right position */
1887         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1888         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1889         unsigned  base_bits  = get_mode_size_bits(mode);
1890         unsigned  shiftwidth = base_bits - bitsize;
1891
1892         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1893         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1894
1895         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1896         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1897         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1898
1899         /* load current value */
1900         ir_node   *mem             = get_store();
1901         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
1902                                           set_volatile ? cons_volatile : cons_none);
1903         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1904         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1905         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1906         ir_tarval *inv_mask        = tarval_not(shift_mask);
1907         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1908         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1909
1910         /* construct new value and store */
1911         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
1912         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1913                                          set_volatile ? cons_volatile : cons_none);
1914         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1915         set_store(store_mem);
1916
1917         if (!need_return)
1918                 return NULL;
1919
1920         ir_node *res_shr;
1921         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
1922         if (mode_is_signed(mode)) {
1923                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
1924         } else {
1925                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
1926         }
1927         return res_shr;
1928 }
1929
1930 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1931                                          ir_node *addr)
1932 {
1933         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
1934         entity_t *entity    = expression->compound_entry;
1935         type_t   *base_type = entity->declaration.type;
1936         ir_mode  *mode      = get_ir_mode_storage(base_type);
1937         ir_node  *mem       = get_store();
1938         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
1939         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1940         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
1941         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1942
1943         ir_mode  *amode     = mode;
1944         /* optimisation, since shifting in modes < machine_size is usually
1945          * less efficient */
1946         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
1947                 amode = mode_uint;
1948         }
1949         unsigned amode_size = get_mode_size_bits(amode);
1950         load_res = create_conv(dbgi, load_res, amode);
1951
1952         set_store(load_mem);
1953
1954         /* kill upper bits */
1955         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1956         unsigned   bitoffset   = entity->compound_member.bit_offset;
1957         unsigned   bitsize     = entity->compound_member.bit_size;
1958         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
1959         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
1960         ir_node   *countl      = new_d_Const(dbgi, tvl);
1961         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
1962
1963         unsigned   shift_bitsr = bitoffset + shift_bitsl;
1964         assert(shift_bitsr <= amode_size);
1965         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
1966         ir_node   *countr      = new_d_Const(dbgi, tvr);
1967         ir_node   *shiftr;
1968         if (mode_is_signed(mode)) {
1969                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
1970         } else {
1971                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
1972         }
1973
1974         type_t  *type    = expression->base.type;
1975         ir_mode *resmode = get_ir_mode_arithmetic(type);
1976         return create_conv(dbgi, shiftr, resmode);
1977 }
1978
1979 /* make sure the selected compound type is constructed */
1980 static void construct_select_compound(const select_expression_t *expression)
1981 {
1982         type_t *type = skip_typeref(expression->compound->base.type);
1983         if (is_type_pointer(type)) {
1984                 type = type->pointer.points_to;
1985         }
1986         (void) get_ir_type(type);
1987 }
1988
1989 static ir_node *set_value_for_expression_addr(const expression_t *expression,
1990                                               ir_node *value, ir_node *addr)
1991 {
1992         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
1993         type_t   *type = skip_typeref(expression->base.type);
1994
1995         if (!is_type_compound(type)) {
1996                 ir_mode  *mode = get_ir_mode_storage(type);
1997                 value          = create_conv(dbgi, value, mode);
1998         }
1999
2000         if (expression->kind == EXPR_REFERENCE) {
2001                 const reference_expression_t *ref = &expression->reference;
2002
2003                 entity_t *entity = ref->entity;
2004                 assert(is_declaration(entity));
2005                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2006                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2007                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2008                         set_value(entity->variable.v.value_number, value);
2009                         return value;
2010                 }
2011         }
2012
2013         if (addr == NULL)
2014                 addr = expression_to_addr(expression);
2015         assert(addr != NULL);
2016
2017         if (expression->kind == EXPR_SELECT) {
2018                 const select_expression_t *select = &expression->select;
2019
2020                 construct_select_compound(select);
2021
2022                 entity_t *entity = select->compound_entry;
2023                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2024                 if (entity->compound_member.bitfield) {
2025                         ir_entity *irentity = entity->compound_member.entity;
2026                         bool       set_volatile
2027                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2028                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2029                                                        set_volatile, true);
2030                         return value;
2031                 }
2032         }
2033
2034         assign_value(dbgi, addr, type, value);
2035         return value;
2036 }
2037
2038 static void set_value_for_expression(const expression_t *expression,
2039                                      ir_node *value)
2040 {
2041         set_value_for_expression_addr(expression, value, NULL);
2042 }
2043
2044 static ir_node *get_value_from_lvalue(const expression_t *expression,
2045                                       ir_node *addr)
2046 {
2047         if (expression->kind == EXPR_REFERENCE) {
2048                 const reference_expression_t *ref = &expression->reference;
2049
2050                 entity_t *entity = ref->entity;
2051                 assert(entity->kind == ENTITY_VARIABLE
2052                                 || entity->kind == ENTITY_PARAMETER);
2053                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2054                 int value_number;
2055                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2056                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2057                         value_number = entity->variable.v.value_number;
2058                         assert(addr == NULL);
2059                         type_t  *type = skip_typeref(expression->base.type);
2060                         ir_mode *mode = get_ir_mode_storage(type);
2061                         ir_node *res  = get_value(value_number, mode);
2062                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2063                 }
2064         }
2065
2066         assert(addr != NULL);
2067         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2068
2069         ir_node *value;
2070         if (expression->kind == EXPR_SELECT &&
2071             expression->select.compound_entry->compound_member.bitfield) {
2072             construct_select_compound(&expression->select);
2073                 value = bitfield_extract_to_firm(&expression->select, addr);
2074         } else {
2075                 value = deref_address(dbgi, expression->base.type, addr);
2076         }
2077
2078         return value;
2079 }
2080
2081
2082 static ir_node *create_incdec(const unary_expression_t *expression)
2083 {
2084         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2085         const expression_t *value_expr = expression->value;
2086         ir_node            *addr       = expression_to_addr(value_expr);
2087         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2088
2089         type_t  *type = skip_typeref(expression->base.type);
2090         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2091
2092         ir_node *offset;
2093         if (is_type_pointer(type)) {
2094                 pointer_type_t *pointer_type = &type->pointer;
2095                 offset = get_type_size_node(pointer_type->points_to);
2096         } else {
2097                 assert(is_type_arithmetic(type));
2098                 offset = new_Const(get_mode_one(mode));
2099         }
2100
2101         ir_node *result;
2102         ir_node *store_value;
2103         switch(expression->base.kind) {
2104         case EXPR_UNARY_POSTFIX_INCREMENT:
2105                 result      = value;
2106                 store_value = new_d_Add(dbgi, value, offset, mode);
2107                 break;
2108         case EXPR_UNARY_POSTFIX_DECREMENT:
2109                 result      = value;
2110                 store_value = new_d_Sub(dbgi, value, offset, mode);
2111                 break;
2112         case EXPR_UNARY_PREFIX_INCREMENT:
2113                 result      = new_d_Add(dbgi, value, offset, mode);
2114                 store_value = result;
2115                 break;
2116         case EXPR_UNARY_PREFIX_DECREMENT:
2117                 result      = new_d_Sub(dbgi, value, offset, mode);
2118                 store_value = result;
2119                 break;
2120         default:
2121                 panic("no incdec expr in create_incdec");
2122         }
2123
2124         set_value_for_expression_addr(value_expr, store_value, addr);
2125
2126         return result;
2127 }
2128
2129 static bool is_local_variable(expression_t *expression)
2130 {
2131         if (expression->kind != EXPR_REFERENCE)
2132                 return false;
2133         reference_expression_t *ref_expr = &expression->reference;
2134         entity_t               *entity   = ref_expr->entity;
2135         if (entity->kind != ENTITY_VARIABLE)
2136                 return false;
2137         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2138         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2139 }
2140
2141 static ir_relation get_relation(const expression_kind_t kind)
2142 {
2143         switch(kind) {
2144         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2145         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2146         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2147         case EXPR_BINARY_ISLESS:
2148         case EXPR_BINARY_LESS:          return ir_relation_less;
2149         case EXPR_BINARY_ISLESSEQUAL:
2150         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2151         case EXPR_BINARY_ISGREATER:
2152         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2153         case EXPR_BINARY_ISGREATEREQUAL:
2154         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2155         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2156
2157         default:
2158                 break;
2159         }
2160         panic("trying to get ir_relation from non-comparison binexpr type");
2161 }
2162
2163 /**
2164  * Handle the assume optimizer hint: check if a Confirm
2165  * node can be created.
2166  *
2167  * @param dbi    debug info
2168  * @param expr   the IL assume expression
2169  *
2170  * we support here only some simple cases:
2171  *  - var rel const
2172  *  - const rel val
2173  *  - var rel var
2174  */
2175 static ir_node *handle_assume_compare(dbg_info *dbi,
2176                                       const binary_expression_t *expression)
2177 {
2178         expression_t *op1 = expression->left;
2179         expression_t *op2 = expression->right;
2180         entity_t     *var2, *var = NULL;
2181         ir_node      *res      = NULL;
2182         ir_relation   relation = get_relation(expression->base.kind);
2183
2184         if (is_local_variable(op1) && is_local_variable(op2)) {
2185                 var  = op1->reference.entity;
2186             var2 = op2->reference.entity;
2187
2188                 type_t  *const type = skip_typeref(var->declaration.type);
2189                 ir_mode *const mode = get_ir_mode_storage(type);
2190
2191                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2192                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2193
2194                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2195                 set_value(var2->variable.v.value_number, res);
2196
2197                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2198                 set_value(var->variable.v.value_number, res);
2199
2200                 return res;
2201         }
2202
2203         expression_t *con = NULL;
2204         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2205                 var = op1->reference.entity;
2206                 con = op2;
2207         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2208                 relation = get_inversed_relation(relation);
2209                 var = op2->reference.entity;
2210                 con = op1;
2211         }
2212
2213         if (var != NULL) {
2214                 type_t  *const type = skip_typeref(var->declaration.type);
2215                 ir_mode *const mode = get_ir_mode_storage(type);
2216
2217                 res = get_value(var->variable.v.value_number, mode);
2218                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2219                 set_value(var->variable.v.value_number, res);
2220         }
2221         return res;
2222 }
2223
2224 /**
2225  * Handle the assume optimizer hint.
2226  *
2227  * @param dbi    debug info
2228  * @param expr   the IL assume expression
2229  */
2230 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2231 {
2232         switch(expression->kind) {
2233         case EXPR_BINARY_EQUAL:
2234         case EXPR_BINARY_NOTEQUAL:
2235         case EXPR_BINARY_LESS:
2236         case EXPR_BINARY_LESSEQUAL:
2237         case EXPR_BINARY_GREATER:
2238         case EXPR_BINARY_GREATEREQUAL:
2239                 return handle_assume_compare(dbi, &expression->binary);
2240         default:
2241                 return NULL;
2242         }
2243 }
2244
2245 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2246                             type_t *from_type, type_t *type)
2247 {
2248         type = skip_typeref(type);
2249         if (is_type_void(type)) {
2250                 /* make sure firm type is constructed */
2251                 (void) get_ir_type(type);
2252                 return NULL;
2253         }
2254         if (!is_type_scalar(type)) {
2255                 /* make sure firm type is constructed */
2256                 (void) get_ir_type(type);
2257                 return value_node;
2258         }
2259
2260         from_type     = skip_typeref(from_type);
2261         ir_mode *mode = get_ir_mode_storage(type);
2262         /* check for conversion from / to __based types */
2263         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2264                 const variable_t *from_var = from_type->pointer.base_variable;
2265                 const variable_t *to_var   = type->pointer.base_variable;
2266                 if (from_var != to_var) {
2267                         if (from_var != NULL) {
2268                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2269                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2270                                 value_node = new_d_Add(dbgi, value_node, base, mode);
2271                         }
2272                         if (to_var != NULL) {
2273                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2274                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2275                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2276                         }
2277                 }
2278         }
2279
2280         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2281                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2282                  * convert to mode_b so we only get a 0/1 value */
2283                 value_node = create_conv(dbgi, value_node, mode_b);
2284         }
2285
2286         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2287         ir_node *node       = create_conv(dbgi, value_node, mode);
2288         node                = create_conv(dbgi, node, mode_arith);
2289
2290         return node;
2291 }
2292
2293 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2294 {
2295         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2296         type_t   *type = skip_typeref(expression->base.type);
2297
2298         const expression_t *value = expression->value;
2299
2300         switch(expression->base.kind) {
2301         case EXPR_UNARY_TAKE_ADDRESS:
2302                 return expression_to_addr(value);
2303
2304         case EXPR_UNARY_NEGATE: {
2305                 ir_node *value_node = expression_to_firm(value);
2306                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2307                 return new_d_Minus(dbgi, value_node, mode);
2308         }
2309         case EXPR_UNARY_PLUS:
2310                 return expression_to_firm(value);
2311         case EXPR_UNARY_BITWISE_NEGATE: {
2312                 ir_node *value_node = expression_to_firm(value);
2313                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2314                 return new_d_Not(dbgi, value_node, mode);
2315         }
2316         case EXPR_UNARY_NOT: {
2317                 ir_node *value_node = _expression_to_firm(value);
2318                 value_node          = create_conv(dbgi, value_node, mode_b);
2319                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2320                 return res;
2321         }
2322         case EXPR_UNARY_DEREFERENCE: {
2323                 ir_node *value_node = expression_to_firm(value);
2324                 type_t  *value_type = skip_typeref(value->base.type);
2325                 assert(is_type_pointer(value_type));
2326
2327                 /* check for __based */
2328                 const variable_t *const base_var = value_type->pointer.base_variable;
2329                 if (base_var != NULL) {
2330                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2331                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2332                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2333                 }
2334                 type_t  *points_to  = value_type->pointer.points_to;
2335                 return deref_address(dbgi, points_to, value_node);
2336         }
2337         case EXPR_UNARY_POSTFIX_INCREMENT:
2338         case EXPR_UNARY_POSTFIX_DECREMENT:
2339         case EXPR_UNARY_PREFIX_INCREMENT:
2340         case EXPR_UNARY_PREFIX_DECREMENT:
2341                 return create_incdec(expression);
2342         case EXPR_UNARY_CAST: {
2343                 ir_node *value_node = expression_to_firm(value);
2344                 type_t  *from_type  = value->base.type;
2345                 return create_cast(dbgi, value_node, from_type, type);
2346         }
2347         case EXPR_UNARY_ASSUME:
2348                 return handle_assume(dbgi, value);
2349
2350         default:
2351                 break;
2352         }
2353         panic("invalid UNEXPR type found");
2354 }
2355
2356 /**
2357  * produces a 0/1 depending of the value of a mode_b node
2358  */
2359 static ir_node *produce_condition_result(const expression_t *expression,
2360                                          ir_mode *mode, dbg_info *dbgi)
2361 {
2362         ir_node *const one_block  = new_immBlock();
2363         ir_node *const zero_block = new_immBlock();
2364         create_condition_evaluation(expression, one_block, zero_block);
2365         mature_immBlock(one_block);
2366         mature_immBlock(zero_block);
2367
2368         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2369         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2370         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2371         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2372         set_cur_block(block);
2373
2374         ir_node *const one   = new_Const(get_mode_one(mode));
2375         ir_node *const zero  = new_Const(get_mode_null(mode));
2376         ir_node *const in[2] = { one, zero };
2377         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2378
2379         return val;
2380 }
2381
2382 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2383                 ir_node *value, type_t *type)
2384 {
2385         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2386         assert(is_type_pointer(type));
2387         pointer_type_t *const pointer_type = &type->pointer;
2388         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2389         ir_node        *      elem_size    = get_type_size_node(points_to);
2390         elem_size                          = create_conv(dbgi, elem_size, mode);
2391         value                              = create_conv(dbgi, value,     mode);
2392         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2393         return mul;
2394 }
2395
2396 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2397                           ir_node *left, ir_node *right)
2398 {
2399         ir_mode  *mode;
2400         type_t   *type_left  = skip_typeref(expression->left->base.type);
2401         type_t   *type_right = skip_typeref(expression->right->base.type);
2402
2403         expression_kind_t kind = expression->base.kind;
2404
2405         switch (kind) {
2406         case EXPR_BINARY_SHIFTLEFT:
2407         case EXPR_BINARY_SHIFTRIGHT:
2408         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2409         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2410                 mode  = get_ir_mode_arithmetic(expression->base.type);
2411                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2412                 break;
2413
2414         case EXPR_BINARY_SUB:
2415                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2416                         const pointer_type_t *const ptr_type = &type_left->pointer;
2417
2418                         mode = get_ir_mode_arithmetic(expression->base.type);
2419                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2420                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2421                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2422                         ir_node *const no_mem    = new_NoMem();
2423                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2424                                                                                                    mode, op_pin_state_floats);
2425                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2426                 }
2427                 /* fallthrough */
2428         case EXPR_BINARY_SUB_ASSIGN:
2429                 if (is_type_pointer(type_left)) {
2430                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2431                         mode  = get_ir_mode_arithmetic(type_left);
2432                         break;
2433                 }
2434                 goto normal_node;
2435
2436         case EXPR_BINARY_ADD:
2437         case EXPR_BINARY_ADD_ASSIGN:
2438                 if (is_type_pointer(type_left)) {
2439                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2440                         mode  = get_ir_mode_arithmetic(type_left);
2441                         break;
2442                 } else if (is_type_pointer(type_right)) {
2443                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2444                         mode  = get_ir_mode_arithmetic(type_right);
2445                         break;
2446                 }
2447                 goto normal_node;
2448
2449         default:
2450 normal_node:
2451                 mode = get_ir_mode_arithmetic(type_right);
2452                 left = create_conv(dbgi, left, mode);
2453                 break;
2454         }
2455
2456         switch (kind) {
2457         case EXPR_BINARY_ADD_ASSIGN:
2458         case EXPR_BINARY_ADD:
2459                 return new_d_Add(dbgi, left, right, mode);
2460         case EXPR_BINARY_SUB_ASSIGN:
2461         case EXPR_BINARY_SUB:
2462                 return new_d_Sub(dbgi, left, right, mode);
2463         case EXPR_BINARY_MUL_ASSIGN:
2464         case EXPR_BINARY_MUL:
2465                 return new_d_Mul(dbgi, left, right, mode);
2466         case EXPR_BINARY_BITWISE_AND:
2467         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2468                 return new_d_And(dbgi, left, right, mode);
2469         case EXPR_BINARY_BITWISE_OR:
2470         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2471                 return new_d_Or(dbgi, left, right, mode);
2472         case EXPR_BINARY_BITWISE_XOR:
2473         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2474                 return new_d_Eor(dbgi, left, right, mode);
2475         case EXPR_BINARY_SHIFTLEFT:
2476         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2477                 return new_d_Shl(dbgi, left, right, mode);
2478         case EXPR_BINARY_SHIFTRIGHT:
2479         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2480                 if (mode_is_signed(mode)) {
2481                         return new_d_Shrs(dbgi, left, right, mode);
2482                 } else {
2483                         return new_d_Shr(dbgi, left, right, mode);
2484                 }
2485         case EXPR_BINARY_DIV:
2486         case EXPR_BINARY_DIV_ASSIGN: {
2487                 ir_node *pin = new_Pin(new_NoMem());
2488                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2489                                          op_pin_state_floats);
2490                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2491                 return res;
2492         }
2493         case EXPR_BINARY_MOD:
2494         case EXPR_BINARY_MOD_ASSIGN: {
2495                 ir_node *pin = new_Pin(new_NoMem());
2496                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2497                                          op_pin_state_floats);
2498                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2499                 return res;
2500         }
2501         default:
2502                 panic("unexpected expression kind");
2503         }
2504 }
2505
2506 static ir_node *create_lazy_op(const binary_expression_t *expression)
2507 {
2508         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2509         type_t   *type = skip_typeref(expression->base.type);
2510         ir_mode  *mode = get_ir_mode_arithmetic(type);
2511
2512         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2513                 bool val = fold_constant_to_bool(expression->left);
2514                 expression_kind_t ekind = expression->base.kind;
2515                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2516                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2517                         if (!val) {
2518                                 return new_Const(get_mode_null(mode));
2519                         }
2520                 } else {
2521                         if (val) {
2522                                 return new_Const(get_mode_one(mode));
2523                         }
2524                 }
2525
2526                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2527                         bool valr = fold_constant_to_bool(expression->right);
2528                         return create_Const_from_bool(mode, valr);
2529                 }
2530
2531                 return produce_condition_result(expression->right, mode, dbgi);
2532         }
2533
2534         return produce_condition_result((const expression_t*) expression, mode,
2535                                         dbgi);
2536 }
2537
2538 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2539                                             ir_node *right, ir_mode *mode);
2540
2541 static ir_node *create_assign_binop(const binary_expression_t *expression)
2542 {
2543         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2544         const expression_t *left_expr = expression->left;
2545         type_t             *type      = skip_typeref(left_expr->base.type);
2546         ir_node            *right     = expression_to_firm(expression->right);
2547         ir_node            *left_addr = expression_to_addr(left_expr);
2548         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2549         ir_node            *result    = create_op(dbgi, expression, left, right);
2550
2551         result = create_cast(dbgi, result, expression->right->base.type, type);
2552
2553         result = set_value_for_expression_addr(left_expr, result, left_addr);
2554
2555         if (!is_type_compound(type)) {
2556                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2557                 result = create_conv(dbgi, result, mode_arithmetic);
2558         }
2559         return result;
2560 }
2561
2562 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2563 {
2564         expression_kind_t kind = expression->base.kind;
2565
2566         switch(kind) {
2567         case EXPR_BINARY_EQUAL:
2568         case EXPR_BINARY_NOTEQUAL:
2569         case EXPR_BINARY_LESS:
2570         case EXPR_BINARY_LESSEQUAL:
2571         case EXPR_BINARY_GREATER:
2572         case EXPR_BINARY_GREATEREQUAL:
2573         case EXPR_BINARY_ISGREATER:
2574         case EXPR_BINARY_ISGREATEREQUAL:
2575         case EXPR_BINARY_ISLESS:
2576         case EXPR_BINARY_ISLESSEQUAL:
2577         case EXPR_BINARY_ISLESSGREATER:
2578         case EXPR_BINARY_ISUNORDERED: {
2579                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2580                 ir_node    *left     = expression_to_firm(expression->left);
2581                 ir_node    *right    = expression_to_firm(expression->right);
2582                 ir_relation relation = get_relation(kind);
2583                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2584                 return cmp;
2585         }
2586         case EXPR_BINARY_ASSIGN: {
2587                 ir_node *addr  = expression_to_addr(expression->left);
2588                 ir_node *right = expression_to_firm(expression->right);
2589                 ir_node *res
2590                         = set_value_for_expression_addr(expression->left, right, addr);
2591
2592                 type_t  *type            = skip_typeref(expression->base.type);
2593                 if (!is_type_compound(type)) {
2594                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2595                         res                      = create_conv(NULL, res, mode_arithmetic);
2596                 }
2597                 return res;
2598         }
2599         case EXPR_BINARY_ADD:
2600         case EXPR_BINARY_SUB:
2601         case EXPR_BINARY_MUL:
2602         case EXPR_BINARY_DIV:
2603         case EXPR_BINARY_MOD:
2604         case EXPR_BINARY_BITWISE_AND:
2605         case EXPR_BINARY_BITWISE_OR:
2606         case EXPR_BINARY_BITWISE_XOR:
2607         case EXPR_BINARY_SHIFTLEFT:
2608         case EXPR_BINARY_SHIFTRIGHT:
2609         {
2610                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2611                 ir_node  *left  = expression_to_firm(expression->left);
2612                 ir_node  *right = expression_to_firm(expression->right);
2613                 return create_op(dbgi, expression, left, right);
2614         }
2615         case EXPR_BINARY_LOGICAL_AND:
2616         case EXPR_BINARY_LOGICAL_OR:
2617                 return create_lazy_op(expression);
2618         case EXPR_BINARY_COMMA:
2619                 /* create side effects of left side */
2620                 (void) expression_to_firm(expression->left);
2621                 return _expression_to_firm(expression->right);
2622
2623         case EXPR_BINARY_ADD_ASSIGN:
2624         case EXPR_BINARY_SUB_ASSIGN:
2625         case EXPR_BINARY_MUL_ASSIGN:
2626         case EXPR_BINARY_MOD_ASSIGN:
2627         case EXPR_BINARY_DIV_ASSIGN:
2628         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2629         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2630         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2631         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2632         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2633                 return create_assign_binop(expression);
2634         default:
2635                 panic("invalid binexpr type");
2636         }
2637 }
2638
2639 static ir_node *array_access_addr(const array_access_expression_t *expression)
2640 {
2641         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2642         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2643         ir_node  *offset      = expression_to_firm(expression->index);
2644         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2645         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2646         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2647
2648         return result;
2649 }
2650
2651 static ir_node *array_access_to_firm(
2652                 const array_access_expression_t *expression)
2653 {
2654         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2655         ir_node  *addr   = array_access_addr(expression);
2656         type_t   *type   = revert_automatic_type_conversion(
2657                         (const expression_t*) expression);
2658         type             = skip_typeref(type);
2659
2660         return deref_address(dbgi, type, addr);
2661 }
2662
2663 static long get_offsetof_offset(const offsetof_expression_t *expression)
2664 {
2665         type_t *orig_type = expression->type;
2666         long    offset    = 0;
2667
2668         designator_t *designator = expression->designator;
2669         for ( ; designator != NULL; designator = designator->next) {
2670                 type_t *type = skip_typeref(orig_type);
2671                 /* be sure the type is constructed */
2672                 (void) get_ir_type(type);
2673
2674                 if (designator->symbol != NULL) {
2675                         assert(is_type_compound(type));
2676                         symbol_t *symbol = designator->symbol;
2677
2678                         compound_t *compound = type->compound.compound;
2679                         entity_t   *iter     = compound->members.entities;
2680                         for (; iter->base.symbol != symbol; iter = iter->base.next) {}
2681
2682                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2683                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2684                         offset += get_entity_offset(iter->compound_member.entity);
2685
2686                         orig_type = iter->declaration.type;
2687                 } else {
2688                         expression_t *array_index = designator->array_index;
2689                         assert(designator->array_index != NULL);
2690                         assert(is_type_array(type));
2691
2692                         long index         = fold_constant_to_int(array_index);
2693                         ir_type *arr_type  = get_ir_type(type);
2694                         ir_type *elem_type = get_array_element_type(arr_type);
2695                         long     elem_size = get_type_size_bytes(elem_type);
2696
2697                         offset += index * elem_size;
2698
2699                         orig_type = type->array.element_type;
2700                 }
2701         }
2702
2703         return offset;
2704 }
2705
2706 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2707 {
2708         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2709         long       offset = get_offsetof_offset(expression);
2710         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2711         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2712
2713         return new_d_Const(dbgi, tv);
2714 }
2715
2716 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2717                                      ir_entity *entity, type_t *type);
2718 static ir_initializer_t *create_ir_initializer(
2719                 const initializer_t *initializer, type_t *type);
2720
2721 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2722                                             initializer_t *initializer,
2723                                             type_t *type)
2724 {
2725         /* create the ir_initializer */
2726         PUSH_IRG(get_const_code_irg());
2727         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2728         POP_IRG();
2729
2730         ident     *const id          = id_unique("initializer.%u");
2731         ir_type   *const irtype      = get_ir_type(type);
2732         ir_type   *const global_type = get_glob_type();
2733         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2734         set_entity_ld_ident(entity, id);
2735         set_entity_visibility(entity, ir_visibility_private);
2736         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2737         set_entity_initializer(entity, irinitializer);
2738         return entity;
2739 }
2740
2741 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2742 {
2743         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2744         type_t        *type        = expression->type;
2745         initializer_t *initializer = expression->initializer;
2746
2747         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2748                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2749                 return create_symconst(dbgi, entity);
2750         } else {
2751                 /* create an entity on the stack */
2752                 ident   *const id     = id_unique("CompLit.%u");
2753                 ir_type *const irtype = get_ir_type(type);
2754                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2755
2756                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2757                 set_entity_ld_ident(entity, id);
2758
2759                 /* create initialisation code */
2760                 create_local_initializer(initializer, dbgi, entity, type);
2761
2762                 /* create a sel for the compound literal address */
2763                 ir_node *frame = get_irg_frame(current_ir_graph);
2764                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2765                 return sel;
2766         }
2767 }
2768
2769 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2770 {
2771         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2772         type_t   *const type = expr->type;
2773         ir_node  *const addr = compound_literal_addr(expr);
2774         return deref_address(dbgi, type, addr);
2775 }
2776
2777 /**
2778  * Transform a sizeof expression into Firm code.
2779  */
2780 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2781 {
2782         type_t *const type = skip_typeref(expression->type);
2783         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2784         if (is_type_array(type) && type->array.is_vla
2785                         && expression->tp_expression != NULL) {
2786                 expression_to_firm(expression->tp_expression);
2787         }
2788
2789         return get_type_size_node(type);
2790 }
2791
2792 static entity_t *get_expression_entity(const expression_t *expression)
2793 {
2794         if (expression->kind != EXPR_REFERENCE)
2795                 return NULL;
2796
2797         return expression->reference.entity;
2798 }
2799
2800 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2801 {
2802         switch(entity->kind) {
2803         case DECLARATION_KIND_CASES:
2804                 return entity->declaration.alignment;
2805         case ENTITY_STRUCT:
2806         case ENTITY_UNION:
2807                 return entity->compound.alignment;
2808         case ENTITY_TYPEDEF:
2809                 return entity->typedefe.alignment;
2810         default:
2811                 break;
2812         }
2813         return 0;
2814 }
2815
2816 /**
2817  * Transform an alignof expression into Firm code.
2818  */
2819 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2820 {
2821         unsigned alignment = 0;
2822
2823         const expression_t *tp_expression = expression->tp_expression;
2824         if (tp_expression != NULL) {
2825                 entity_t *entity = get_expression_entity(tp_expression);
2826                 if (entity != NULL) {
2827                         alignment = get_cparser_entity_alignment(entity);
2828                 }
2829         }
2830
2831         if (alignment == 0) {
2832                 type_t *type = expression->type;
2833                 alignment = get_type_alignment(type);
2834         }
2835
2836         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2837         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2838         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2839         return new_d_Const(dbgi, tv);
2840 }
2841
2842 static void init_ir_types(void);
2843
2844 ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2845 {
2846         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2847
2848         bool constant_folding_old = constant_folding;
2849         constant_folding = true;
2850         int old_optimize         = get_optimize();
2851         int old_constant_folding = get_opt_constant_folding();
2852         set_optimize(1);
2853         set_opt_constant_folding(1);
2854
2855         init_ir_types();
2856
2857         PUSH_IRG(get_const_code_irg());
2858         ir_node *const cnst = _expression_to_firm(expression);
2859         POP_IRG();
2860
2861         set_optimize(old_optimize);
2862         set_opt_constant_folding(old_constant_folding);
2863
2864         if (!is_Const(cnst)) {
2865                 panic("couldn't fold constant");
2866         }
2867
2868         constant_folding = constant_folding_old;
2869
2870         ir_tarval *const tv   = get_Const_tarval(cnst);
2871         ir_mode   *const mode = get_ir_mode_arithmetic(skip_typeref(expression->base.type));
2872         return tarval_convert_to(tv, mode);
2873 }
2874
2875 /* this function is only used in parser.c, but it relies on libfirm functionality */
2876 bool constant_is_negative(const expression_t *expression)
2877 {
2878         ir_tarval *tv = fold_constant_to_tarval(expression);
2879         return tarval_is_negative(tv);
2880 }
2881
2882 long fold_constant_to_int(const expression_t *expression)
2883 {
2884         ir_tarval *tv = fold_constant_to_tarval(expression);
2885         if (!tarval_is_long(tv)) {
2886                 panic("result of constant folding is not integer");
2887         }
2888
2889         return get_tarval_long(tv);
2890 }
2891
2892 bool fold_constant_to_bool(const expression_t *expression)
2893 {
2894         ir_tarval *tv = fold_constant_to_tarval(expression);
2895         return !tarval_is_null(tv);
2896 }
2897
2898 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2899 {
2900         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2901
2902         /* first try to fold a constant condition */
2903         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2904                 bool val = fold_constant_to_bool(expression->condition);
2905                 if (val) {
2906                         expression_t *true_expression = expression->true_expression;
2907                         if (true_expression == NULL)
2908                                 true_expression = expression->condition;
2909                         return expression_to_firm(true_expression);
2910                 } else {
2911                         return expression_to_firm(expression->false_expression);
2912                 }
2913         }
2914
2915         ir_node *const true_block  = new_immBlock();
2916         ir_node *const false_block = new_immBlock();
2917         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
2918         mature_immBlock(true_block);
2919         mature_immBlock(false_block);
2920
2921         set_cur_block(true_block);
2922         ir_node *true_val;
2923         if (expression->true_expression != NULL) {
2924                 true_val = expression_to_firm(expression->true_expression);
2925         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
2926                 true_val = cond_expr;
2927         } else {
2928                 /* Condition ended with a short circuit (&&, ||, !) operation or a
2929                  * comparison.  Generate a "1" as value for the true branch. */
2930                 true_val = new_Const(get_mode_one(mode_Is));
2931         }
2932         ir_node *const true_jmp = new_d_Jmp(dbgi);
2933
2934         set_cur_block(false_block);
2935         ir_node *const false_val = expression_to_firm(expression->false_expression);
2936         ir_node *const false_jmp = new_d_Jmp(dbgi);
2937
2938         /* create the common block */
2939         ir_node *const in_cf[2] = { true_jmp, false_jmp };
2940         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2941         set_cur_block(block);
2942
2943         /* TODO improve static semantics, so either both or no values are NULL */
2944         if (true_val == NULL || false_val == NULL)
2945                 return NULL;
2946
2947         ir_node *const in[2] = { true_val, false_val };
2948         type_t  *const type  = skip_typeref(expression->base.type);
2949         ir_mode *const mode  = get_ir_mode_arithmetic(type);
2950         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2951
2952         return val;
2953 }
2954
2955 /**
2956  * Returns an IR-node representing the address of a field.
2957  */
2958 static ir_node *select_addr(const select_expression_t *expression)
2959 {
2960         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2961
2962         construct_select_compound(expression);
2963
2964         ir_node *compound_addr = expression_to_firm(expression->compound);
2965
2966         entity_t *entry = expression->compound_entry;
2967         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2968         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2969
2970         if (constant_folding) {
2971                 ir_mode *mode      = get_irn_mode(compound_addr);
2972                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
2973                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
2974                 return new_d_Add(dbgi, compound_addr, ofs, mode);
2975         } else {
2976                 ir_entity *irentity = entry->compound_member.entity;
2977                 assert(irentity != NULL);
2978                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
2979         }
2980 }
2981
2982 static ir_node *select_to_firm(const select_expression_t *expression)
2983 {
2984         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2985         ir_node  *addr = select_addr(expression);
2986         type_t   *type = revert_automatic_type_conversion(
2987                         (const expression_t*) expression);
2988         type           = skip_typeref(type);
2989
2990         entity_t *entry = expression->compound_entry;
2991         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2992
2993         if (entry->compound_member.bitfield) {
2994                 return bitfield_extract_to_firm(expression, addr);
2995         }
2996
2997         return deref_address(dbgi, type, addr);
2998 }
2999
3000 /* Values returned by __builtin_classify_type. */
3001 typedef enum gcc_type_class
3002 {
3003         no_type_class = -1,
3004         void_type_class,
3005         integer_type_class,
3006         char_type_class,
3007         enumeral_type_class,
3008         boolean_type_class,
3009         pointer_type_class,
3010         reference_type_class,
3011         offset_type_class,
3012         real_type_class,
3013         complex_type_class,
3014         function_type_class,
3015         method_type_class,
3016         record_type_class,
3017         union_type_class,
3018         array_type_class,
3019         string_type_class,
3020         set_type_class,
3021         file_type_class,
3022         lang_type_class
3023 } gcc_type_class;
3024
3025 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3026 {
3027         type_t *type = expr->type_expression->base.type;
3028
3029         /* FIXME gcc returns different values depending on whether compiling C or C++
3030          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3031         gcc_type_class tc;
3032         for (;;) {
3033                 type = skip_typeref(type);
3034                 switch (type->kind) {
3035                         case TYPE_ATOMIC: {
3036                                 const atomic_type_t *const atomic_type = &type->atomic;
3037                                 switch (atomic_type->akind) {
3038                                         /* gcc cannot do that */
3039                                         case ATOMIC_TYPE_VOID:
3040                                                 tc = void_type_class;
3041                                                 goto make_const;
3042
3043                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3044                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3045                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3046                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3047                                         case ATOMIC_TYPE_SHORT:
3048                                         case ATOMIC_TYPE_USHORT:
3049                                         case ATOMIC_TYPE_INT:
3050                                         case ATOMIC_TYPE_UINT:
3051                                         case ATOMIC_TYPE_LONG:
3052                                         case ATOMIC_TYPE_ULONG:
3053                                         case ATOMIC_TYPE_LONGLONG:
3054                                         case ATOMIC_TYPE_ULONGLONG:
3055                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3056                                                 tc = integer_type_class;
3057                                                 goto make_const;
3058
3059                                         case ATOMIC_TYPE_FLOAT:
3060                                         case ATOMIC_TYPE_DOUBLE:
3061                                         case ATOMIC_TYPE_LONG_DOUBLE:
3062                                                 tc = real_type_class;
3063                                                 goto make_const;
3064                                 }
3065                                 panic("Unexpected atomic type in classify_type_to_firm().");
3066                         }
3067
3068                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3069                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3070                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3071                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3072                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3073                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3074                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3075
3076                         /* gcc handles this as integer */
3077                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3078
3079                         /* gcc classifies the referenced type */
3080                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3081
3082                         /* typedef/typeof should be skipped already */
3083                         case TYPE_TYPEDEF:
3084                         case TYPE_TYPEOF:
3085                         case TYPE_ERROR:
3086                                 break;
3087                 }
3088                 panic("unexpected TYPE classify_type_to_firm().");
3089         }
3090
3091 make_const:;
3092         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3093         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3094         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3095         return new_d_Const(dbgi, tv);
3096 }
3097
3098 static ir_node *function_name_to_firm(
3099                 const funcname_expression_t *const expr)
3100 {
3101         switch(expr->kind) {
3102         case FUNCNAME_FUNCTION:
3103         case FUNCNAME_PRETTY_FUNCTION:
3104         case FUNCNAME_FUNCDNAME:
3105                 if (current_function_name == NULL) {
3106                         source_position_t const *const src_pos = &expr->base.source_position;
3107                         char              const *const name    = current_function_entity->base.symbol->string;
3108                         string_t                 const string  = { name, strlen(name), STRING_ENCODING_CHAR };
3109                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3110                 }
3111                 return current_function_name;
3112         case FUNCNAME_FUNCSIG:
3113                 if (current_funcsig == NULL) {
3114                         source_position_t const *const src_pos = &expr->base.source_position;
3115                         ir_entity               *const ent     = get_irg_entity(current_ir_graph);
3116                         char              const *const name    = get_entity_ld_name(ent);
3117                         string_t                 const string  = { name, strlen(name), STRING_ENCODING_CHAR };
3118                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3119                 }
3120                 return current_funcsig;
3121         }
3122         panic("Unsupported function name");
3123 }
3124
3125 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3126 {
3127         statement_t *statement = expr->statement;
3128
3129         assert(statement->kind == STATEMENT_COMPOUND);
3130         return compound_statement_to_firm(&statement->compound);
3131 }
3132
3133 static ir_node *va_start_expression_to_firm(
3134         const va_start_expression_t *const expr)
3135 {
3136         ir_entity *param_ent = current_vararg_entity;
3137         if (param_ent == NULL) {
3138                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3139                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3140                 ir_type *const param_type  = get_unknown_type();
3141                 param_ent = new_parameter_entity(frame_type, n, param_type);
3142                 current_vararg_entity = param_ent;
3143         }
3144
3145         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3146         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3147         ir_node  *const no_mem  = new_NoMem();
3148         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3149
3150         set_value_for_expression(expr->ap, arg_sel);
3151
3152         return NULL;
3153 }
3154
3155 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3156 {
3157         type_t       *const type    = expr->base.type;
3158         expression_t *const ap_expr = expr->ap;
3159         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3160         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3161         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3162         ir_node      *const res     = deref_address(dbgi, type, ap);
3163
3164         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3165         ir_mode      *const mode    = get_irn_mode(cnst);
3166         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3167         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3168         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3169         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3170         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3171
3172         set_value_for_expression_addr(ap_expr, add, ap_addr);
3173
3174         return res;
3175 }
3176
3177 /**
3178  * Generate Firm for a va_copy expression.
3179  */
3180 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3181 {
3182         ir_node *const src = expression_to_firm(expr->src);
3183         set_value_for_expression(expr->dst, src);
3184         return NULL;
3185 }
3186
3187 static ir_node *dereference_addr(const unary_expression_t *const expression)
3188 {
3189         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3190         return expression_to_firm(expression->value);
3191 }
3192
3193 /**
3194  * Returns a IR-node representing an lvalue of the given expression.
3195  */
3196 static ir_node *expression_to_addr(const expression_t *expression)
3197 {
3198         switch(expression->kind) {
3199         case EXPR_ARRAY_ACCESS:
3200                 return array_access_addr(&expression->array_access);
3201         case EXPR_CALL:
3202                 return call_expression_to_firm(&expression->call);
3203         case EXPR_COMPOUND_LITERAL:
3204                 return compound_literal_addr(&expression->compound_literal);
3205         case EXPR_REFERENCE:
3206                 return reference_addr(&expression->reference);
3207         case EXPR_SELECT:
3208                 return select_addr(&expression->select);
3209         case EXPR_UNARY_DEREFERENCE:
3210                 return dereference_addr(&expression->unary);
3211         default:
3212                 break;
3213         }
3214         panic("trying to get address of non-lvalue");
3215 }
3216
3217 static ir_node *builtin_constant_to_firm(
3218                 const builtin_constant_expression_t *expression)
3219 {
3220         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3221         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3222         return create_Const_from_bool(mode, v);
3223 }
3224
3225 static ir_node *builtin_types_compatible_to_firm(
3226                 const builtin_types_compatible_expression_t *expression)
3227 {
3228         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3229         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3230         bool     const value = types_compatible(left, right);
3231         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3232         return create_Const_from_bool(mode, value);
3233 }
3234
3235 static ir_node *get_label_block(label_t *label)
3236 {
3237         if (label->block != NULL)
3238                 return label->block;
3239
3240         ir_node *block = new_immBlock();
3241         label->block = block;
3242         if (label->address_taken)
3243                 ARR_APP1(ir_node*, ijmp_blocks, block);
3244         return block;
3245 }
3246
3247 /**
3248  * Pointer to a label.  This is used for the
3249  * GNU address-of-label extension.
3250  */
3251 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3252 {
3253         /* Beware: Might be called from create initializer with current_ir_graph
3254          * set to const_code_irg. */
3255         PUSH_IRG(current_function);
3256         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3257         ir_node   *block  = get_label_block(label->label);
3258         ir_entity *entity = create_Block_entity(block);
3259         POP_IRG();
3260
3261         symconst_symbol value;
3262         value.entity_p = entity;
3263         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3264 }
3265
3266 /**
3267  * creates firm nodes for an expression. The difference between this function
3268  * and expression_to_firm is, that this version might produce mode_b nodes
3269  * instead of mode_Is.
3270  */
3271 static ir_node *_expression_to_firm(expression_t const *const expr)
3272 {
3273 #ifndef NDEBUG
3274         if (!constant_folding) {
3275                 assert(!expr->base.transformed);
3276                 ((expression_t*)expr)->base.transformed = true;
3277         }
3278 #endif
3279
3280         switch (expr->kind) {
3281         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3282         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3283         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3284         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3285         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3286         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3287         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3288         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3289         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3290         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3291         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3292         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3293         case EXPR_LITERAL_CHARACTER:          return char_literal_to_firm(            &expr->string_literal);
3294         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3295         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3296         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3297         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3298         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3299         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3300         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3301         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3302         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3303         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3304
3305         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->string_literal.value);
3306
3307         case EXPR_ERROR: break;
3308         }
3309         panic("invalid expression found");
3310 }
3311
3312 /**
3313  * Check if a given expression is a GNU __builtin_expect() call.
3314  */
3315 static bool is_builtin_expect(const expression_t *expression)
3316 {
3317         if (expression->kind != EXPR_CALL)
3318                 return false;
3319
3320         expression_t *function = expression->call.function;
3321         if (function->kind != EXPR_REFERENCE)
3322                 return false;
3323         reference_expression_t *ref = &function->reference;
3324         if (ref->entity->kind         != ENTITY_FUNCTION ||
3325             ref->entity->function.btk != BUILTIN_EXPECT)
3326                 return false;
3327
3328         return true;
3329 }
3330
3331 static bool produces_mode_b(const expression_t *expression)
3332 {
3333         switch (expression->kind) {
3334         case EXPR_BINARY_EQUAL:
3335         case EXPR_BINARY_NOTEQUAL:
3336         case EXPR_BINARY_LESS:
3337         case EXPR_BINARY_LESSEQUAL:
3338         case EXPR_BINARY_GREATER:
3339         case EXPR_BINARY_GREATEREQUAL:
3340         case EXPR_BINARY_ISGREATER:
3341         case EXPR_BINARY_ISGREATEREQUAL:
3342         case EXPR_BINARY_ISLESS:
3343         case EXPR_BINARY_ISLESSEQUAL:
3344         case EXPR_BINARY_ISLESSGREATER:
3345         case EXPR_BINARY_ISUNORDERED:
3346         case EXPR_UNARY_NOT:
3347                 return true;
3348
3349         case EXPR_CALL:
3350                 if (is_builtin_expect(expression)) {
3351                         expression_t *argument = expression->call.arguments->expression;
3352                         return produces_mode_b(argument);
3353                 }
3354                 return false;
3355         case EXPR_BINARY_COMMA:
3356                 return produces_mode_b(expression->binary.right);
3357
3358         default:
3359                 return false;
3360         }
3361 }
3362
3363 static ir_node *expression_to_firm(const expression_t *expression)
3364 {
3365         if (!produces_mode_b(expression)) {
3366                 ir_node *res = _expression_to_firm(expression);
3367                 assert(res == NULL || get_irn_mode(res) != mode_b);
3368                 return res;
3369         }
3370
3371         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3372                 return new_Const(fold_constant_to_tarval(expression));
3373         }
3374
3375         /* we have to produce a 0/1 from the mode_b expression */
3376         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3377         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3378         return produce_condition_result(expression, mode, dbgi);
3379 }
3380
3381 /**
3382  * create a short-circuit expression evaluation that tries to construct
3383  * efficient control flow structures for &&, || and ! expressions
3384  */
3385 static ir_node *create_condition_evaluation(const expression_t *expression,
3386                                             ir_node *true_block,
3387                                             ir_node *false_block)
3388 {
3389         switch(expression->kind) {
3390         case EXPR_UNARY_NOT: {
3391                 const unary_expression_t *unary_expression = &expression->unary;
3392                 create_condition_evaluation(unary_expression->value, false_block,
3393                                             true_block);
3394                 return NULL;
3395         }
3396         case EXPR_BINARY_LOGICAL_AND: {
3397                 const binary_expression_t *binary_expression = &expression->binary;
3398
3399                 ir_node *extra_block = new_immBlock();
3400                 create_condition_evaluation(binary_expression->left, extra_block,
3401                                             false_block);
3402                 mature_immBlock(extra_block);
3403                 set_cur_block(extra_block);
3404                 create_condition_evaluation(binary_expression->right, true_block,
3405                                             false_block);
3406                 return NULL;
3407         }
3408         case EXPR_BINARY_LOGICAL_OR: {
3409                 const binary_expression_t *binary_expression = &expression->binary;
3410
3411                 ir_node *extra_block = new_immBlock();
3412                 create_condition_evaluation(binary_expression->left, true_block,
3413                                             extra_block);
3414                 mature_immBlock(extra_block);
3415                 set_cur_block(extra_block);
3416                 create_condition_evaluation(binary_expression->right, true_block,
3417                                             false_block);
3418                 return NULL;
3419         }
3420         default:
3421                 break;
3422         }
3423
3424         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3425         ir_node  *cond_expr  = _expression_to_firm(expression);
3426         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3427         ir_node  *cond       = new_d_Cond(dbgi, condition);
3428         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3429         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3430
3431         /* set branch prediction info based on __builtin_expect */
3432         if (is_builtin_expect(expression) && is_Cond(cond)) {
3433                 call_argument_t *argument = expression->call.arguments->next;
3434                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3435                         bool               const cnst = fold_constant_to_bool(argument->expression);
3436                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3437                         set_Cond_jmp_pred(cond, pred);
3438                 }
3439         }
3440
3441         add_immBlock_pred(true_block, true_proj);
3442         add_immBlock_pred(false_block, false_proj);
3443
3444         set_unreachable_now();
3445         return cond_expr;
3446 }
3447
3448 static void create_variable_entity(entity_t *variable,
3449                                    declaration_kind_t declaration_kind,
3450                                    ir_type *parent_type)
3451 {
3452         assert(variable->kind == ENTITY_VARIABLE);
3453         type_t    *type = skip_typeref(variable->declaration.type);
3454
3455         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3456         ir_type   *const irtype    = get_ir_type(type);
3457         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3458         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3459         unsigned         alignment = variable->declaration.alignment;
3460
3461         set_entity_alignment(irentity, alignment);
3462
3463         handle_decl_modifiers(irentity, variable);
3464
3465         variable->declaration.kind  = (unsigned char) declaration_kind;
3466         variable->variable.v.entity = irentity;
3467         set_entity_ld_ident(irentity, create_ld_ident(variable));
3468
3469         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3470                 set_entity_volatility(irentity, volatility_is_volatile);
3471         }
3472 }
3473
3474
3475 typedef struct type_path_entry_t type_path_entry_t;
3476 struct type_path_entry_t {
3477         type_t           *type;
3478         ir_initializer_t *initializer;
3479         size_t            index;
3480         entity_t         *compound_entry;
3481 };
3482
3483 typedef struct type_path_t type_path_t;
3484 struct type_path_t {
3485         type_path_entry_t *path;
3486         type_t            *top_type;
3487         bool               invalid;
3488 };
3489
3490 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3491 {
3492         size_t len = ARR_LEN(path->path);
3493
3494         for (size_t i = 0; i < len; ++i) {
3495                 const type_path_entry_t *entry = & path->path[i];
3496
3497                 type_t *type = skip_typeref(entry->type);
3498                 if (is_type_compound(type)) {
3499                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3500                 } else if (is_type_array(type)) {
3501                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3502                 } else {
3503                         fprintf(stderr, "-INVALID-");
3504                 }
3505         }
3506         fprintf(stderr, "  (");
3507         print_type(path->top_type);
3508         fprintf(stderr, ")");
3509 }
3510
3511 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3512 {
3513         size_t len = ARR_LEN(path->path);
3514         assert(len > 0);
3515         return & path->path[len-1];
3516 }
3517
3518 static type_path_entry_t *append_to_type_path(type_path_t *path)
3519 {
3520         size_t len = ARR_LEN(path->path);
3521         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3522
3523         type_path_entry_t *result = & path->path[len];
3524         memset(result, 0, sizeof(result[0]));
3525         return result;
3526 }
3527
3528 static size_t get_compound_member_count(const compound_type_t *type)
3529 {
3530         compound_t *compound  = type->compound;
3531         size_t      n_members = 0;
3532         entity_t   *member    = compound->members.entities;
3533         for ( ; member != NULL; member = member->base.next) {
3534                 ++n_members;
3535         }
3536
3537         return n_members;
3538 }
3539
3540 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3541 {
3542         type_t *orig_top_type = path->top_type;
3543         type_t *top_type      = skip_typeref(orig_top_type);
3544
3545         assert(is_type_compound(top_type) || is_type_array(top_type));
3546
3547         if (ARR_LEN(path->path) == 0) {
3548                 return NULL;
3549         } else {
3550                 type_path_entry_t *top         = get_type_path_top(path);
3551                 ir_initializer_t  *initializer = top->initializer;
3552                 return get_initializer_compound_value(initializer, top->index);
3553         }
3554 }
3555
3556 static void descend_into_subtype(type_path_t *path)
3557 {
3558         type_t *orig_top_type = path->top_type;
3559         type_t *top_type      = skip_typeref(orig_top_type);
3560
3561         assert(is_type_compound(top_type) || is_type_array(top_type));
3562
3563         ir_initializer_t *initializer = get_initializer_entry(path);
3564
3565         type_path_entry_t *top = append_to_type_path(path);
3566         top->type              = top_type;
3567
3568         size_t len;
3569
3570         if (is_type_compound(top_type)) {
3571                 compound_t *const compound = top_type->compound.compound;
3572                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3573
3574                 top->compound_entry = entry;
3575                 top->index          = 0;
3576                 len                 = get_compound_member_count(&top_type->compound);
3577                 if (entry != NULL) {
3578                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3579                         path->top_type = entry->declaration.type;
3580                 }
3581         } else {
3582                 assert(is_type_array(top_type));
3583                 assert(top_type->array.size > 0);
3584
3585                 top->index     = 0;
3586                 path->top_type = top_type->array.element_type;
3587                 len            = top_type->array.size;
3588         }
3589         if (initializer == NULL
3590                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3591                 initializer = create_initializer_compound(len);
3592                 /* we have to set the entry at the 2nd latest path entry... */
3593                 size_t path_len = ARR_LEN(path->path);
3594                 assert(path_len >= 1);
3595                 if (path_len > 1) {
3596                         type_path_entry_t *entry        = & path->path[path_len-2];
3597                         ir_initializer_t  *tinitializer = entry->initializer;
3598                         set_initializer_compound_value(tinitializer, entry->index,
3599                                                        initializer);
3600                 }
3601         }
3602         top->initializer = initializer;
3603 }
3604
3605 static void ascend_from_subtype(type_path_t *path)
3606 {
3607         type_path_entry_t *top = get_type_path_top(path);
3608
3609         path->top_type = top->type;
3610
3611         size_t len = ARR_LEN(path->path);
3612         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3613 }
3614
3615 static void walk_designator(type_path_t *path, const designator_t *designator)
3616 {
3617         /* designators start at current object type */
3618         ARR_RESIZE(type_path_entry_t, path->path, 1);
3619
3620         for ( ; designator != NULL; designator = designator->next) {
3621                 type_path_entry_t *top         = get_type_path_top(path);
3622                 type_t            *orig_type   = top->type;
3623                 type_t            *type        = skip_typeref(orig_type);
3624
3625                 if (designator->symbol != NULL) {
3626                         assert(is_type_compound(type));
3627                         size_t    index  = 0;
3628                         symbol_t *symbol = designator->symbol;
3629
3630                         compound_t *compound = type->compound.compound;
3631                         entity_t   *iter     = compound->members.entities;
3632                         for (; iter->base.symbol != symbol; iter = iter->base.next, ++index) {}
3633                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3634
3635                         /* revert previous initialisations of other union elements */
3636                         if (type->kind == TYPE_COMPOUND_UNION) {
3637                                 ir_initializer_t *initializer = top->initializer;
3638                                 if (initializer != NULL
3639                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3640                                         /* are we writing to a new element? */
3641                                         ir_initializer_t *oldi
3642                                                 = get_initializer_compound_value(initializer, index);
3643                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3644                                                 /* clear initializer */
3645                                                 size_t len
3646                                                         = get_initializer_compound_n_entries(initializer);
3647                                                 ir_initializer_t *nulli = get_initializer_null();
3648                                                 for (size_t i = 0; i < len; ++i) {
3649                                                         set_initializer_compound_value(initializer, i,
3650                                                                                        nulli);
3651                                                 }
3652                                         }
3653                                 }
3654                         }
3655
3656                         top->type           = orig_type;
3657                         top->compound_entry = iter;
3658                         top->index          = index;
3659                         orig_type           = iter->declaration.type;
3660                 } else {
3661                         expression_t *array_index = designator->array_index;
3662                         assert(is_type_array(type));
3663
3664                         long index = fold_constant_to_int(array_index);
3665                         assert(0 <= index && (!type->array.size_constant || (size_t)index < type->array.size));
3666
3667                         top->type  = orig_type;
3668                         top->index = (size_t) index;
3669                         orig_type  = type->array.element_type;
3670                 }
3671                 path->top_type = orig_type;
3672
3673                 if (designator->next != NULL) {
3674                         descend_into_subtype(path);
3675                 }
3676         }
3677
3678         path->invalid  = false;
3679 }
3680
3681 static void advance_current_object(type_path_t *path)
3682 {
3683         if (path->invalid) {
3684                 /* TODO: handle this... */
3685                 panic("invalid initializer in ast2firm (excessive elements)");
3686         }
3687
3688         type_path_entry_t *top = get_type_path_top(path);
3689
3690         type_t *type = skip_typeref(top->type);
3691         if (is_type_union(type)) {
3692                 /* only the first element is initialized in unions */
3693                 top->compound_entry = NULL;
3694         } else if (is_type_struct(type)) {
3695                 entity_t *entry = top->compound_entry;
3696
3697                 top->index++;
3698                 entry               = skip_unnamed_bitfields(entry->base.next);
3699                 top->compound_entry = entry;
3700                 if (entry != NULL) {
3701                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3702                         path->top_type = entry->declaration.type;
3703                         return;
3704                 }
3705         } else {
3706                 assert(is_type_array(type));
3707
3708                 top->index++;
3709                 if (!type->array.size_constant || top->index < type->array.size) {
3710                         return;
3711                 }
3712         }
3713
3714         /* we're past the last member of the current sub-aggregate, try if we
3715          * can ascend in the type hierarchy and continue with another subobject */
3716         size_t len = ARR_LEN(path->path);
3717
3718         if (len > 1) {
3719                 ascend_from_subtype(path);
3720                 advance_current_object(path);
3721         } else {
3722                 path->invalid = true;
3723         }
3724 }
3725
3726
3727 static ir_initializer_t *create_ir_initializer_value(
3728                 const initializer_value_t *initializer)
3729 {
3730         if (is_type_compound(initializer->value->base.type)) {
3731                 panic("initializer creation for compounds not implemented yet");
3732         }
3733         type_t       *type = initializer->value->base.type;
3734         expression_t *expr = initializer->value;
3735         ir_node *value = expression_to_firm(expr);
3736         ir_mode *mode  = get_ir_mode_storage(type);
3737         value          = create_conv(NULL, value, mode);
3738         return create_initializer_const(value);
3739 }
3740
3741 /** test wether type can be initialized by a string constant */
3742 static bool is_string_type(type_t *type)
3743 {
3744         if (!is_type_array(type))
3745                 return false;
3746
3747         type_t *const inner = skip_typeref(type->array.element_type);
3748         return is_type_integer(inner);
3749 }
3750
3751 static ir_initializer_t *create_ir_initializer_list(
3752                 const initializer_list_t *initializer, type_t *type)
3753 {
3754         type_path_t path;
3755         memset(&path, 0, sizeof(path));
3756         path.top_type = type;
3757         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3758
3759         descend_into_subtype(&path);
3760
3761         for (size_t i = 0; i < initializer->len; ++i) {
3762                 const initializer_t *sub_initializer = initializer->initializers[i];
3763
3764                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3765                         walk_designator(&path, sub_initializer->designator.designator);
3766                         continue;
3767                 }
3768
3769                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3770                         /* we might have to descend into types until we're at a scalar
3771                          * type */
3772                         while(true) {
3773                                 type_t *orig_top_type = path.top_type;
3774                                 type_t *top_type      = skip_typeref(orig_top_type);
3775
3776                                 if (is_type_scalar(top_type))
3777                                         break;
3778                                 descend_into_subtype(&path);
3779                         }
3780                 } else if (sub_initializer->kind == INITIALIZER_STRING) {
3781                         /* we might have to descend into types until we're at a scalar
3782                          * type */
3783                         while (true) {
3784                                 type_t *orig_top_type = path.top_type;
3785                                 type_t *top_type      = skip_typeref(orig_top_type);
3786
3787                                 if (is_string_type(top_type))
3788                                         break;
3789                                 descend_into_subtype(&path);
3790                         }
3791                 }
3792
3793                 ir_initializer_t *sub_irinitializer
3794                         = create_ir_initializer(sub_initializer, path.top_type);
3795
3796                 size_t path_len = ARR_LEN(path.path);
3797                 assert(path_len >= 1);
3798                 type_path_entry_t *entry        = & path.path[path_len-1];
3799                 ir_initializer_t  *tinitializer = entry->initializer;
3800                 set_initializer_compound_value(tinitializer, entry->index,
3801                                                sub_irinitializer);
3802
3803                 advance_current_object(&path);
3804         }
3805
3806         assert(ARR_LEN(path.path) >= 1);
3807         ir_initializer_t *result = path.path[0].initializer;
3808         DEL_ARR_F(path.path);
3809
3810         return result;
3811 }
3812
3813 static ir_initializer_t *create_ir_initializer_string(initializer_t const *const init, type_t *type)
3814 {
3815         type = skip_typeref(type);
3816
3817         assert(type->kind == TYPE_ARRAY);
3818         assert(type->array.size_constant);
3819         string_literal_expression_t const *const str = get_init_string(init);
3820         size_t            const str_len = str->value.size;
3821         size_t            const arr_len = type->array.size;
3822         ir_initializer_t *const irinit  = create_initializer_compound(arr_len);
3823         ir_mode          *const mode    = get_ir_mode_storage(type->array.element_type);
3824         char const       *      p       = str->value.begin;
3825         switch (str->value.encoding) {
3826         case STRING_ENCODING_CHAR:
3827                 for (size_t i = 0; i != arr_len; ++i) {
3828                         char              const c      = i < str_len ? *p++ : 0;
3829                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3830                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3831                         set_initializer_compound_value(irinit, i, tvinit);
3832                 }
3833                 break;
3834
3835         case STRING_ENCODING_WIDE:
3836                 for (size_t i = 0; i != arr_len; ++i) {
3837                         utf32             const c      = i < str_len ? read_utf8_char(&p) : 0;
3838                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3839                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3840                         set_initializer_compound_value(irinit, i, tvinit);
3841                 }
3842                 break;
3843         }
3844
3845         return irinit;
3846 }
3847
3848 static ir_initializer_t *create_ir_initializer(
3849                 const initializer_t *initializer, type_t *type)
3850 {
3851         switch(initializer->kind) {
3852                 case INITIALIZER_STRING:
3853                         return create_ir_initializer_string(initializer, type);
3854
3855                 case INITIALIZER_LIST:
3856                         return create_ir_initializer_list(&initializer->list, type);
3857
3858                 case INITIALIZER_VALUE:
3859                         return create_ir_initializer_value(&initializer->value);
3860
3861                 case INITIALIZER_DESIGNATOR:
3862                         panic("unexpected designator initializer found");
3863         }
3864         panic("unknown initializer");
3865 }
3866
3867 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3868  *  are elements [...] the remainder of the aggregate shall be initialized
3869  *  implicitly the same as objects that have static storage duration. */
3870 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3871                 ir_node *base_addr)
3872 {
3873         /* for unions we must NOT do anything for null initializers */
3874         ir_type *owner = get_entity_owner(entity);
3875         if (is_Union_type(owner)) {
3876                 return;
3877         }
3878
3879         ir_type *ent_type = get_entity_type(entity);
3880         /* create sub-initializers for a compound type */
3881         if (is_compound_type(ent_type)) {
3882                 unsigned n_members = get_compound_n_members(ent_type);
3883                 for (unsigned n = 0; n < n_members; ++n) {
3884                         ir_entity *member = get_compound_member(ent_type, n);
3885                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3886                                                                 member);
3887                         create_dynamic_null_initializer(member, dbgi, addr);
3888                 }
3889                 return;
3890         }
3891         if (is_Array_type(ent_type)) {
3892                 assert(has_array_upper_bound(ent_type, 0));
3893                 long n = get_array_upper_bound_int(ent_type, 0);
3894                 for (long i = 0; i < n; ++i) {
3895                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3896                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3897                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3898                         ir_node   *in[1]    = { cnst };
3899                         ir_entity *arrent   = get_array_element_entity(ent_type);
3900                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3901                                                         arrent);
3902                         create_dynamic_null_initializer(arrent, dbgi, addr);
3903                 }
3904                 return;
3905         }
3906
3907         ir_mode *value_mode = get_type_mode(ent_type);
3908         ir_node *node       = new_Const(get_mode_null(value_mode));
3909
3910         /* is it a bitfield type? */
3911         if (is_Primitive_type(ent_type) &&
3912                         get_primitive_base_type(ent_type) != NULL) {
3913                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3914                 return;
3915         }
3916
3917         ir_node *mem    = get_store();
3918         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3919         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3920         set_store(proj_m);
3921 }
3922
3923 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
3924                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
3925 {
3926         switch(get_initializer_kind(initializer)) {
3927         case IR_INITIALIZER_NULL:
3928                 create_dynamic_null_initializer(entity, dbgi, base_addr);
3929                 return;
3930         case IR_INITIALIZER_CONST: {
3931                 ir_node *node     = get_initializer_const_value(initializer);
3932                 ir_type *ent_type = get_entity_type(entity);
3933
3934                 /* is it a bitfield type? */
3935                 if (is_Primitive_type(ent_type) &&
3936                                 get_primitive_base_type(ent_type) != NULL) {
3937                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3938                         return;
3939                 }
3940
3941                 assert(get_type_mode(type) == get_irn_mode(node));
3942                 ir_node *mem    = get_store();
3943                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3944                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3945                 set_store(proj_m);
3946                 return;
3947         }
3948         case IR_INITIALIZER_TARVAL: {
3949                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
3950                 ir_node   *cnst     = new_d_Const(dbgi, tv);
3951                 ir_type   *ent_type = get_entity_type(entity);
3952
3953                 /* is it a bitfield type? */
3954                 if (is_Primitive_type(ent_type) &&
3955                                 get_primitive_base_type(ent_type) != NULL) {
3956                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
3957                         return;
3958                 }
3959
3960                 assert(get_type_mode(type) == get_tarval_mode(tv));
3961                 ir_node *mem    = get_store();
3962                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
3963                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3964                 set_store(proj_m);
3965                 return;
3966         }
3967         case IR_INITIALIZER_COMPOUND: {
3968                 assert(is_compound_type(type) || is_Array_type(type));
3969                 int n_members;
3970                 if (is_Array_type(type)) {
3971                         assert(has_array_upper_bound(type, 0));
3972                         n_members = get_array_upper_bound_int(type, 0);
3973                 } else {
3974                         n_members = get_compound_n_members(type);
3975                 }
3976
3977                 if (get_initializer_compound_n_entries(initializer)
3978                                 != (unsigned) n_members)
3979                         panic("initializer doesn't match compound type");
3980
3981                 for (int i = 0; i < n_members; ++i) {
3982                         ir_node   *addr;
3983                         ir_type   *irtype;
3984                         ir_entity *sub_entity;
3985                         if (is_Array_type(type)) {
3986                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3987                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3988                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3989                                 ir_node   *in[1]    = { cnst };
3990                                 irtype     = get_array_element_type(type);
3991                                 sub_entity = get_array_element_entity(type);
3992                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3993                                                        sub_entity);
3994                         } else {
3995                                 sub_entity = get_compound_member(type, i);
3996                                 irtype     = get_entity_type(sub_entity);
3997                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3998                                                              sub_entity);
3999                         }
4000
4001                         ir_initializer_t *sub_init
4002                                 = get_initializer_compound_value(initializer, i);
4003
4004                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4005                                                        addr);
4006                 }
4007                 return;
4008         }
4009         }
4010
4011         panic("invalid IR_INITIALIZER found");
4012 }
4013
4014 static void create_dynamic_initializer(ir_initializer_t *initializer,
4015                 dbg_info *dbgi, ir_entity *entity)
4016 {
4017         ir_node *frame     = get_irg_frame(current_ir_graph);
4018         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4019         ir_type *type      = get_entity_type(entity);
4020
4021         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4022 }
4023
4024 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4025                                      ir_entity *entity, type_t *type)
4026 {
4027         ir_node *memory = get_store();
4028         ir_node *nomem  = new_NoMem();
4029         ir_node *frame  = get_irg_frame(current_ir_graph);
4030         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4031
4032         if (initializer->kind == INITIALIZER_VALUE) {
4033                 initializer_value_t *initializer_value = &initializer->value;
4034
4035                 ir_node *value = expression_to_firm(initializer_value->value);
4036                 type = skip_typeref(type);
4037                 assign_value(dbgi, addr, type, value);
4038                 return;
4039         }
4040
4041         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4042                 ir_initializer_t *irinitializer
4043                         = create_ir_initializer(initializer, type);
4044
4045                 create_dynamic_initializer(irinitializer, dbgi, entity);
4046                 return;
4047         }
4048
4049         /* create a "template" entity which is copied to the entity on the stack */
4050         ir_entity *const init_entity
4051                 = create_initializer_entity(dbgi, initializer, type);
4052         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4053         ir_type *const irtype   = get_ir_type(type);
4054         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4055
4056         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4057         set_store(copyb_mem);
4058 }
4059
4060 static void create_initializer_local_variable_entity(entity_t *entity)
4061 {
4062         assert(entity->kind == ENTITY_VARIABLE);
4063         initializer_t *initializer = entity->variable.initializer;
4064         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4065         ir_entity     *irentity    = entity->variable.v.entity;
4066         type_t        *type        = entity->declaration.type;
4067
4068         create_local_initializer(initializer, dbgi, irentity, type);
4069 }
4070
4071 static void create_variable_initializer(entity_t *entity)
4072 {
4073         assert(entity->kind == ENTITY_VARIABLE);
4074         initializer_t *initializer = entity->variable.initializer;
4075         if (initializer == NULL)
4076                 return;
4077
4078         declaration_kind_t declaration_kind
4079                 = (declaration_kind_t) entity->declaration.kind;
4080         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4081                 create_initializer_local_variable_entity(entity);
4082                 return;
4083         }
4084
4085         type_t            *type = entity->declaration.type;
4086         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4087
4088         if (initializer->kind == INITIALIZER_VALUE) {
4089                 expression_t *      value     = initializer->value.value;
4090                 type_t       *const init_type = skip_typeref(value->base.type);
4091
4092                 if (!is_type_scalar(init_type)) {
4093                         /* skip convs */
4094                         while (value->kind == EXPR_UNARY_CAST)
4095                                 value = value->unary.value;
4096
4097                         if (value->kind != EXPR_COMPOUND_LITERAL)
4098                                 panic("expected non-scalar initializer to be a compound literal");
4099                         initializer = value->compound_literal.initializer;
4100                         goto have_initializer;
4101                 }
4102
4103                 ir_node  *      node = expression_to_firm(value);
4104                 dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
4105                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4106                 node = create_conv(dbgi, node, mode);
4107
4108                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4109                         set_value(entity->variable.v.value_number, node);
4110                 } else {
4111                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4112
4113                         ir_entity *irentity = entity->variable.v.entity;
4114
4115                         if (tq & TYPE_QUALIFIER_CONST
4116                                         && get_entity_owner(irentity) != get_tls_type()) {
4117                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4118                         }
4119                         set_atomic_ent_value(irentity, node);
4120                 }
4121         } else {
4122 have_initializer:
4123                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4124                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4125
4126                 ir_entity        *irentity        = entity->variable.v.entity;
4127                 ir_initializer_t *irinitializer
4128                         = create_ir_initializer(initializer, type);
4129
4130                 if (tq & TYPE_QUALIFIER_CONST) {
4131                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4132                 }
4133                 set_entity_initializer(irentity, irinitializer);
4134         }
4135 }
4136
4137 static void create_variable_length_array(entity_t *entity)
4138 {
4139         assert(entity->kind == ENTITY_VARIABLE);
4140         assert(entity->variable.initializer == NULL);
4141
4142         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4143         entity->variable.v.vla_base = NULL;
4144
4145         /* TODO: record VLA somewhere so we create the free node when we leave
4146          * it's scope */
4147 }
4148
4149 static void allocate_variable_length_array(entity_t *entity)
4150 {
4151         assert(entity->kind == ENTITY_VARIABLE);
4152         assert(entity->variable.initializer == NULL);
4153         assert(currently_reachable());
4154
4155         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4156         type_t   *type      = entity->declaration.type;
4157         ir_type  *el_type   = get_ir_type(type->array.element_type);
4158
4159         /* make sure size_node is calculated */
4160         get_type_size_node(type);
4161         ir_node  *elems = type->array.size_node;
4162         ir_node  *mem   = get_store();
4163         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4164
4165         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4166         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4167         set_store(proj_m);
4168
4169         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4170         entity->variable.v.vla_base = addr;
4171 }
4172
4173 static bool var_needs_entity(variable_t const *const var)
4174 {
4175         if (var->address_taken)
4176                 return true;
4177         type_t *const type = skip_typeref(var->base.type);
4178         return !is_type_scalar(type) || type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
4179 }
4180
4181 /**
4182  * Creates a Firm local variable from a declaration.
4183  */
4184 static void create_local_variable(entity_t *entity)
4185 {
4186         assert(entity->kind == ENTITY_VARIABLE);
4187         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4188
4189         if (!var_needs_entity(&entity->variable)) {
4190                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4191                 entity->variable.v.value_number = next_value_number_function;
4192                 set_irg_loc_description(current_ir_graph, next_value_number_function, entity);
4193                 ++next_value_number_function;
4194                 return;
4195         }
4196
4197         /* is it a variable length array? */
4198         type_t *const type = skip_typeref(entity->declaration.type);
4199         if (is_type_array(type) && !type->array.size_constant) {
4200                 create_variable_length_array(entity);
4201                 return;
4202         }
4203
4204         ir_type *const frame_type = get_irg_frame_type(current_ir_graph);
4205         create_variable_entity(entity, DECLARATION_KIND_LOCAL_VARIABLE_ENTITY, frame_type);
4206 }
4207
4208 static void create_local_static_variable(entity_t *entity)
4209 {
4210         assert(entity->kind == ENTITY_VARIABLE);
4211         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4212
4213         type_t   *type           = skip_typeref(entity->declaration.type);
4214         ir_type  *const var_type = entity->variable.thread_local ?
4215                 get_tls_type() : get_glob_type();
4216         ir_type  *const irtype   = get_ir_type(type);
4217         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4218
4219         size_t l = strlen(entity->base.symbol->string);
4220         char   buf[l + sizeof(".%u")];
4221         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4222         ident     *const id       = id_unique(buf);
4223         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4224
4225         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4226                 set_entity_volatility(irentity, volatility_is_volatile);
4227         }
4228
4229         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4230         entity->variable.v.entity = irentity;
4231
4232         set_entity_ld_ident(irentity, id);
4233         set_entity_visibility(irentity, ir_visibility_local);
4234
4235         if (entity->variable.initializer == NULL) {
4236                 ir_initializer_t *null_init = get_initializer_null();
4237                 set_entity_initializer(irentity, null_init);
4238         }
4239
4240         PUSH_IRG(get_const_code_irg());
4241         create_variable_initializer(entity);
4242         POP_IRG();
4243 }
4244
4245
4246
4247 static ir_node *return_statement_to_firm(return_statement_t *statement)
4248 {
4249         if (!currently_reachable())
4250                 return NULL;
4251
4252         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4253         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4254         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4255
4256         int in_len;
4257         if (!is_type_void(type)) {
4258                 ir_mode *const mode = get_ir_mode_storage(type);
4259                 if (res) {
4260                         res = create_conv(dbgi, res, mode);
4261                 } else {
4262                         res = new_Unknown(mode);
4263                 }
4264                 in_len = 1;
4265         } else {
4266                 in_len = 0;
4267         }
4268
4269         ir_node *const in[1] = { res };
4270         ir_node *const store = get_store();
4271         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4272
4273         ir_node *end_block = get_irg_end_block(current_ir_graph);
4274         add_immBlock_pred(end_block, ret);
4275
4276         set_unreachable_now();
4277         return NULL;
4278 }
4279
4280 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4281 {
4282         if (!currently_reachable())
4283                 return NULL;
4284
4285         return expression_to_firm(statement->expression);
4286 }
4287
4288 static void create_local_declarations(entity_t*);
4289
4290 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4291 {
4292         create_local_declarations(compound->scope.entities);
4293
4294         ir_node     *result    = NULL;
4295         statement_t *statement = compound->statements;
4296         for ( ; statement != NULL; statement = statement->base.next) {
4297                 result = statement_to_firm(statement);
4298         }
4299
4300         return result;
4301 }
4302
4303 static void create_global_variable(entity_t *entity)
4304 {
4305         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4306         ir_visibility       visibility = ir_visibility_external;
4307         storage_class_tag_t storage
4308                 = (storage_class_tag_t)entity->declaration.storage_class;
4309         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4310         assert(entity->kind == ENTITY_VARIABLE);
4311
4312         switch (storage) {
4313         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4314         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4315         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4316         case STORAGE_CLASS_TYPEDEF:
4317         case STORAGE_CLASS_AUTO:
4318         case STORAGE_CLASS_REGISTER:
4319                 panic("invalid storage class for global var");
4320         }
4321
4322         /* "common" symbols */
4323         if (storage == STORAGE_CLASS_NONE
4324             && entity->variable.initializer == NULL
4325             && !entity->variable.thread_local
4326             && (modifiers & DM_WEAK) == 0) {
4327                 linkage |= IR_LINKAGE_MERGE;
4328         }
4329
4330         ir_type *var_type = get_glob_type();
4331         if (entity->variable.thread_local) {
4332                 var_type = get_tls_type();
4333         }
4334         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4335         ir_entity *irentity = entity->variable.v.entity;
4336         add_entity_linkage(irentity, linkage);
4337         set_entity_visibility(irentity, visibility);
4338         if (entity->variable.initializer == NULL
4339             && storage != STORAGE_CLASS_EXTERN) {
4340                 ir_initializer_t *null_init = get_initializer_null();
4341                 set_entity_initializer(irentity, null_init);
4342         }
4343 }
4344
4345 static void create_local_declaration(entity_t *entity)
4346 {
4347         assert(is_declaration(entity));
4348
4349         /* construct type */
4350         (void) get_ir_type(entity->declaration.type);
4351         if (entity->base.symbol == NULL) {
4352                 return;
4353         }
4354
4355         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4356         case STORAGE_CLASS_STATIC:
4357                 if (entity->kind == ENTITY_FUNCTION) {
4358                         (void)get_function_entity(entity, NULL);
4359                 } else {
4360                         create_local_static_variable(entity);
4361                 }
4362                 return;
4363         case STORAGE_CLASS_EXTERN:
4364                 if (entity->kind == ENTITY_FUNCTION) {
4365                         assert(entity->function.body == NULL);
4366                         (void)get_function_entity(entity, NULL);
4367                 } else {
4368                         create_global_variable(entity);
4369                         create_variable_initializer(entity);
4370                 }
4371                 return;
4372         case STORAGE_CLASS_NONE:
4373         case STORAGE_CLASS_AUTO:
4374         case STORAGE_CLASS_REGISTER:
4375                 if (entity->kind == ENTITY_FUNCTION) {
4376                         if (entity->function.body != NULL) {
4377                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4378                                 (void)get_function_entity(entity, owner);
4379                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4380                                 enqueue_inner_function(entity);
4381                         } else {
4382                                 (void)get_function_entity(entity, NULL);
4383                         }
4384                 } else {
4385                         create_local_variable(entity);
4386                 }
4387                 return;
4388         case STORAGE_CLASS_TYPEDEF:
4389                 break;
4390         }
4391         panic("invalid storage class found");
4392 }
4393
4394 static void create_local_declarations(entity_t *e)
4395 {
4396         for (; e; e = e->base.next) {
4397                 if (is_declaration(e))
4398                         create_local_declaration(e);
4399         }
4400 }
4401
4402 static void initialize_local_declaration(entity_t *entity)
4403 {
4404         if (entity->base.symbol == NULL)
4405                 return;
4406
4407         // no need to emit code in dead blocks
4408         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4409                         && !currently_reachable())
4410                 return;
4411
4412         switch ((declaration_kind_t) entity->declaration.kind) {
4413         case DECLARATION_KIND_LOCAL_VARIABLE:
4414         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4415                 create_variable_initializer(entity);
4416                 return;
4417
4418         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4419                 allocate_variable_length_array(entity);
4420                 return;
4421
4422         case DECLARATION_KIND_COMPOUND_MEMBER:
4423         case DECLARATION_KIND_GLOBAL_VARIABLE:
4424         case DECLARATION_KIND_FUNCTION:
4425         case DECLARATION_KIND_INNER_FUNCTION:
4426                 return;
4427
4428         case DECLARATION_KIND_PARAMETER:
4429         case DECLARATION_KIND_PARAMETER_ENTITY:
4430                 panic("can't initialize parameters");
4431
4432         case DECLARATION_KIND_UNKNOWN:
4433                 panic("can't initialize unknown declaration");
4434         }
4435         panic("invalid declaration kind");
4436 }
4437
4438 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4439 {
4440         entity_t *entity = statement->declarations_begin;
4441         if (entity == NULL)
4442                 return NULL;
4443
4444         entity_t *const last = statement->declarations_end;
4445         for ( ;; entity = entity->base.next) {
4446                 if (is_declaration(entity)) {
4447                         initialize_local_declaration(entity);
4448                 } else if (entity->kind == ENTITY_TYPEDEF) {
4449                         /* §6.7.7:3  Any array size expressions associated with variable length
4450                          * array declarators are evaluated each time the declaration of the
4451                          * typedef name is reached in the order of execution. */
4452                         type_t *const type = skip_typeref(entity->typedefe.type);
4453                         if (is_type_array(type) && type->array.is_vla)
4454                                 get_vla_size(&type->array);
4455                 }
4456                 if (entity == last)
4457                         break;
4458         }
4459
4460         return NULL;
4461 }
4462
4463 static ir_node *if_statement_to_firm(if_statement_t *statement)
4464 {
4465         create_local_declarations(statement->scope.entities);
4466
4467         /* Create the condition. */
4468         ir_node *true_block  = NULL;
4469         ir_node *false_block = NULL;
4470         if (currently_reachable()) {
4471                 true_block  = new_immBlock();
4472                 false_block = new_immBlock();
4473                 create_condition_evaluation(statement->condition, true_block, false_block);
4474                 mature_immBlock(true_block);
4475                 mature_immBlock(false_block);
4476         }
4477
4478         /* Create the true statement. */
4479         set_cur_block(true_block);
4480         statement_to_firm(statement->true_statement);
4481         ir_node *fallthrough_block = get_cur_block();
4482
4483         /* Create the false statement. */
4484         set_cur_block(false_block);
4485         if (statement->false_statement != NULL) {
4486                 statement_to_firm(statement->false_statement);
4487         }
4488
4489         /* Handle the block after the if-statement.  Minor simplification and
4490          * optimisation: Reuse the false/true block as fallthrough block, if the
4491          * true/false statement does not pass control to the fallthrough block, e.g.
4492          * in the typical if (x) return; pattern. */
4493         if (fallthrough_block) {
4494                 if (currently_reachable()) {
4495                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4496                         ir_node *const f_jump = new_Jmp();
4497                         ir_node *const in[]   = { t_jump, f_jump };
4498                         fallthrough_block = new_Block(2, in);
4499                 }
4500                 set_cur_block(fallthrough_block);
4501         }
4502
4503         return NULL;
4504 }
4505
4506 /**
4507  * Add an unconditional jump to the target block.  If the source block is not
4508  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4509  * loops.  This is necessary if the jump potentially enters a loop.
4510  */
4511 static void jump_to(ir_node *const target_block)
4512 {
4513         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4514         add_immBlock_pred(target_block, pred);
4515         set_cur_block(target_block);
4516 }
4517
4518 /**
4519  * Add an unconditional jump to the target block, if the current block is
4520  * reachable and do nothing otherwise.  This is only valid if the jump does not
4521  * enter a loop (a back edge is ok).
4522  */
4523 static void jump_if_reachable(ir_node *const target_block)
4524 {
4525         if (currently_reachable())
4526                 add_immBlock_pred(target_block, new_Jmp());
4527 }
4528
4529 static ir_node *get_break_label(void)
4530 {
4531         if (break_label == NULL) {
4532                 break_label = new_immBlock();
4533         }
4534         return break_label;
4535 }
4536
4537 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4538 {
4539         create_local_declarations(statement->scope.entities);
4540
4541         /* create the header block */
4542         ir_node *header_block = new_immBlock();
4543
4544         PUSH_BREAK(NULL);
4545         PUSH_CONTINUE(header_block);
4546
4547         /* The loop body. */
4548         ir_node            *body_block = NULL;
4549         expression_t *const cond       = statement->condition;
4550         /* Avoid an explicit body block in case of do ... while (0);. */
4551         if (is_constant_expression(cond) != EXPR_CLASS_CONSTANT || fold_constant_to_bool(cond)) {
4552                 /* Not do ... while (0);. */
4553                 body_block = new_immBlock();
4554                 jump_to(body_block);
4555         }
4556         statement_to_firm(statement->body);
4557
4558         /* create the condition */
4559         jump_if_reachable(header_block);
4560         mature_immBlock(header_block);
4561         set_cur_block(header_block);
4562         ir_node *const false_block = get_break_label();
4563         if (body_block) {
4564                 create_condition_evaluation(statement->condition, body_block, false_block);
4565                 mature_immBlock(body_block);
4566         } else {
4567                 jump_if_reachable(false_block);
4568         }
4569         mature_immBlock(false_block);
4570         set_cur_block(false_block);
4571
4572         POP_CONTINUE();
4573         POP_BREAK();
4574         return NULL;
4575 }
4576
4577 static ir_node *for_statement_to_firm(for_statement_t *statement)
4578 {
4579         create_local_declarations(statement->scope.entities);
4580
4581         if (currently_reachable()) {
4582                 entity_t *entity = statement->scope.entities;
4583                 for ( ; entity != NULL; entity = entity->base.next) {
4584                         if (!is_declaration(entity))
4585                                 continue;
4586
4587                         initialize_local_declaration(entity);
4588                 }
4589
4590                 if (statement->initialisation != NULL) {
4591                         expression_to_firm(statement->initialisation);
4592                 }
4593         }
4594
4595         /* Create the header block */
4596         ir_node *const header_block = new_immBlock();
4597         jump_to(header_block);
4598
4599         /* Create the condition. */
4600         ir_node            *false_block;
4601         expression_t *const cond = statement->condition;
4602         if (cond && (is_constant_expression(cond) != EXPR_CLASS_CONSTANT || !fold_constant_to_bool(cond))) {
4603                 false_block = new_immBlock();
4604
4605                 ir_node *const body_block = new_immBlock();
4606                 create_condition_evaluation(cond, body_block, false_block);
4607                 mature_immBlock(body_block);
4608                 set_cur_block(body_block);
4609         } else {
4610                 /* for-ever. */
4611                 false_block = NULL;
4612
4613                 keep_alive(header_block);
4614                 keep_all_memory(header_block);
4615         }
4616
4617         /* Create the step block, if necessary. */
4618         ir_node      *      step_block = header_block;
4619         expression_t *const step       = statement->step;
4620         if (step != NULL) {
4621                 step_block = new_immBlock();
4622         }
4623
4624         PUSH_BREAK(false_block);
4625         PUSH_CONTINUE(step_block);
4626
4627         /* Create the loop body. */
4628         statement_to_firm(statement->body);
4629         jump_if_reachable(step_block);
4630
4631         /* Create the step code. */
4632         if (step != NULL) {
4633                 mature_immBlock(step_block);
4634                 set_cur_block(step_block);
4635                 expression_to_firm(step);
4636                 jump_if_reachable(header_block);
4637         }
4638
4639         mature_immBlock(header_block);
4640         assert(false_block == NULL || false_block == break_label);
4641         false_block = break_label;
4642         if (false_block != NULL) {
4643                 mature_immBlock(false_block);
4644         }
4645         set_cur_block(false_block);
4646
4647         POP_CONTINUE();
4648         POP_BREAK();
4649         return NULL;
4650 }
4651
4652 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4653 {
4654         if (!currently_reachable())
4655                 return NULL;
4656
4657         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4658         ir_node  *jump = new_d_Jmp(dbgi);
4659         add_immBlock_pred(target_block, jump);
4660
4661         set_unreachable_now();
4662         return NULL;
4663 }
4664
4665 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4666 {
4667         /* determine number of cases */
4668         size_t n_cases = 0;
4669         for (case_label_statement_t *l = statement->first_case; l != NULL;
4670              l = l->next) {
4671                 /* default case */
4672                 if (l->expression == NULL)
4673                         continue;
4674                 if (l->is_empty_range)
4675                         continue;
4676                 ++n_cases;
4677         }
4678
4679         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4680         size_t           i   = 0;
4681         for (case_label_statement_t *l = statement->first_case; l != NULL;
4682              l = l->next) {
4683             if (l->expression == NULL) {
4684                         l->pn = pn_Switch_default;
4685                         continue;
4686                 }
4687                 if (l->is_empty_range)
4688                         continue;
4689                 ir_tarval *min = l->first_case;
4690                 ir_tarval *max = l->last_case;
4691                 long       pn  = (long) i+1;
4692                 ir_switch_table_set(res, i++, min, max, pn);
4693                 l->pn = pn;
4694         }
4695         return res;
4696 }
4697
4698 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4699 {
4700         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4701         ir_node  *switch_node = NULL;
4702
4703         if (currently_reachable()) {
4704                 ir_node *expression = expression_to_firm(statement->expression);
4705                 ir_switch_table *table = create_switch_table(statement);
4706                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4707
4708                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4709         }
4710
4711         set_unreachable_now();
4712
4713         PUSH_BREAK(NULL);
4714         ir_node *const old_switch            = current_switch;
4715         const bool     old_saw_default_label = saw_default_label;
4716         saw_default_label                    = false;
4717         current_switch                       = switch_node;
4718
4719         statement_to_firm(statement->body);
4720
4721         if (currently_reachable()) {
4722                 add_immBlock_pred(get_break_label(), new_Jmp());
4723         }
4724
4725         if (!saw_default_label && switch_node) {
4726                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4727                 add_immBlock_pred(get_break_label(), proj);
4728         }
4729
4730         if (break_label != NULL) {
4731                 mature_immBlock(break_label);
4732         }
4733         set_cur_block(break_label);
4734
4735         assert(current_switch == switch_node);
4736         current_switch    = old_switch;
4737         saw_default_label = old_saw_default_label;
4738         POP_BREAK();
4739         return NULL;
4740 }
4741
4742 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4743 {
4744         if (current_switch != NULL && !statement->is_empty_range) {
4745                 ir_node *block = new_immBlock();
4746                 /* Fallthrough from previous case */
4747                 jump_if_reachable(block);
4748
4749                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
4750                 add_immBlock_pred(block, proj);
4751                 if (statement->expression == NULL)
4752                         saw_default_label = true;
4753
4754                 mature_immBlock(block);
4755                 set_cur_block(block);
4756         }
4757
4758         return statement_to_firm(statement->statement);
4759 }
4760
4761 static void try_mature_label(label_t *const label)
4762 {
4763         if (--label->n_users == 0 && !label->address_taken)
4764                 mature_immBlock(label->block);
4765 }
4766
4767 static ir_node *label_to_firm(const label_statement_t *statement)
4768 {
4769         label_t *const label = statement->label;
4770         ir_node *const block = get_label_block(label);
4771         jump_to(block);
4772
4773         keep_alive(block);
4774         keep_all_memory(block);
4775
4776         try_mature_label(label);
4777
4778         return statement_to_firm(statement->statement);
4779 }
4780
4781 static ir_node *goto_statement_to_firm(goto_statement_t *const stmt)
4782 {
4783         label_t *const label = stmt->label;
4784         create_jump_statement((statement_t*)stmt, get_label_block(label));
4785         try_mature_label(label);
4786         return NULL;
4787 }
4788
4789 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4790 {
4791         if (!currently_reachable())
4792                 return NULL;
4793
4794         ir_node  *const irn  = expression_to_firm(statement->expression);
4795         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4796         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
4797
4798         set_irn_link(ijmp, ijmp_list);
4799         ijmp_list = ijmp;
4800
4801         set_unreachable_now();
4802         return NULL;
4803 }
4804
4805 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4806 {
4807         bool           needs_memory = statement->is_volatile;
4808         size_t         n_clobbers   = 0;
4809         asm_clobber_t *clobber      = statement->clobbers;
4810         for ( ; clobber != NULL; clobber = clobber->next) {
4811                 const char *clobber_str = clobber->clobber.begin;
4812
4813                 if (!be_is_valid_clobber(clobber_str)) {
4814                         errorf(&statement->base.source_position,
4815                                    "invalid clobber '%s' specified", clobber->clobber);
4816                         continue;
4817                 }
4818
4819                 if (streq(clobber_str, "memory")) {
4820                         needs_memory = true;
4821                         continue;
4822                 }
4823
4824                 ident *id = new_id_from_str(clobber_str);
4825                 obstack_ptr_grow(&asm_obst, id);
4826                 ++n_clobbers;
4827         }
4828         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4829         ident **clobbers = NULL;
4830         if (n_clobbers > 0) {
4831                 clobbers = obstack_finish(&asm_obst);
4832         }
4833
4834         size_t n_inputs  = 0;
4835         asm_argument_t *argument = statement->inputs;
4836         for ( ; argument != NULL; argument = argument->next)
4837                 n_inputs++;
4838         size_t n_outputs = 0;
4839         argument = statement->outputs;
4840         for ( ; argument != NULL; argument = argument->next)
4841                 n_outputs++;
4842
4843         unsigned next_pos = 0;
4844
4845         ir_node *ins[n_inputs + n_outputs + 1];
4846         size_t   in_size = 0;
4847
4848         ir_asm_constraint tmp_in_constraints[n_outputs];
4849
4850         const expression_t *out_exprs[n_outputs];
4851         ir_node            *out_addrs[n_outputs];
4852         size_t              out_size = 0;
4853
4854         argument = statement->outputs;
4855         for ( ; argument != NULL; argument = argument->next) {
4856                 const char *constraints = argument->constraints.begin;
4857                 asm_constraint_flags_t asm_flags
4858                         = be_parse_asm_constraints(constraints);
4859
4860                 {
4861                         source_position_t const *const pos = &statement->base.source_position;
4862                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4863                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
4864                         }
4865                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4866                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
4867                                 continue;
4868                         }
4869                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
4870                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
4871                                 continue;
4872                         }
4873                 }
4874
4875                 unsigned pos = next_pos++;
4876                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4877                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4878                         expression_t *expr = argument->expression;
4879                         ir_node      *addr = expression_to_addr(expr);
4880                         /* in+output, construct an artifical same_as constraint on the
4881                          * input */
4882                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
4883                                 char     buf[64];
4884                                 ir_node *value = get_value_from_lvalue(expr, addr);
4885
4886                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
4887
4888                                 ir_asm_constraint constraint;
4889                                 constraint.pos              = pos;
4890                                 constraint.constraint       = new_id_from_str(buf);
4891                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
4892                                 tmp_in_constraints[in_size] = constraint;
4893                                 ins[in_size] = value;
4894
4895                                 ++in_size;
4896                         }
4897
4898                         out_exprs[out_size] = expr;
4899                         out_addrs[out_size] = addr;
4900                         ++out_size;
4901                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4902                         /* pure memory ops need no input (but we have to make sure we
4903                          * attach to the memory) */
4904                         assert(! (asm_flags &
4905                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4906                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4907                         needs_memory = true;
4908
4909                         /* we need to attach the address to the inputs */
4910                         expression_t *expr = argument->expression;
4911
4912                         ir_asm_constraint constraint;
4913                         constraint.pos              = pos;
4914                         constraint.constraint       = new_id_from_str(constraints);
4915                         constraint.mode             = mode_M;
4916                         tmp_in_constraints[in_size] = constraint;
4917
4918                         ins[in_size] = expression_to_addr(expr);
4919                         ++in_size;
4920                         continue;
4921                 } else {
4922                         errorf(&statement->base.source_position,
4923                                "only modifiers but no place set in constraints '%s'",
4924                                constraints);
4925                         continue;
4926                 }
4927
4928                 ir_asm_constraint constraint;
4929                 constraint.pos        = pos;
4930                 constraint.constraint = new_id_from_str(constraints);
4931                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
4932
4933                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4934         }
4935         assert(obstack_object_size(&asm_obst)
4936                         == out_size * sizeof(ir_asm_constraint));
4937         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
4938
4939
4940         obstack_grow(&asm_obst, tmp_in_constraints,
4941                      in_size * sizeof(tmp_in_constraints[0]));
4942         /* find and count input and output arguments */
4943         argument = statement->inputs;
4944         for ( ; argument != NULL; argument = argument->next) {
4945                 const char *constraints = argument->constraints.begin;
4946                 asm_constraint_flags_t asm_flags
4947                         = be_parse_asm_constraints(constraints);
4948
4949                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4950                         errorf(&statement->base.source_position,
4951                                "some constraints in '%s' are not supported", constraints);
4952                         continue;
4953                 }
4954                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4955                         errorf(&statement->base.source_position,
4956                                "some constraints in '%s' are invalid", constraints);
4957                         continue;
4958                 }
4959                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
4960                         errorf(&statement->base.source_position,
4961                                "write flag specified for input constraints '%s'",
4962                                constraints);
4963                         continue;
4964                 }
4965
4966                 ir_node *input;
4967                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4968                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4969                         /* we can treat this as "normal" input */
4970                         input = expression_to_firm(argument->expression);
4971                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4972                         /* pure memory ops need no input (but we have to make sure we
4973                          * attach to the memory) */
4974                         assert(! (asm_flags &
4975                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4976                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4977                         needs_memory = true;
4978                         input = expression_to_addr(argument->expression);
4979                 } else {
4980                         errorf(&statement->base.source_position,
4981                                "only modifiers but no place set in constraints '%s'",
4982                                constraints);
4983                         continue;
4984                 }
4985
4986                 ir_asm_constraint constraint;
4987                 constraint.pos        = next_pos++;
4988                 constraint.constraint = new_id_from_str(constraints);
4989                 constraint.mode       = get_irn_mode(input);
4990
4991                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4992                 ins[in_size++] = input;
4993         }
4994
4995         ir_node *mem = needs_memory ? get_store() : new_NoMem();
4996         assert(obstack_object_size(&asm_obst)
4997                         == in_size * sizeof(ir_asm_constraint));
4998         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
4999
5000         /* create asm node */
5001         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5002
5003         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5004
5005         ir_node *node = new_d_ASM(dbgi, mem, in_size, ins, input_constraints,
5006                                   out_size, output_constraints,
5007                                   n_clobbers, clobbers, asm_text);
5008
5009         if (statement->is_volatile) {
5010                 set_irn_pinned(node, op_pin_state_pinned);
5011         } else {
5012                 set_irn_pinned(node, op_pin_state_floats);
5013         }
5014
5015         /* create output projs & connect them */
5016         if (needs_memory) {
5017                 ir_node *projm = new_Proj(node, mode_M, out_size);
5018                 set_store(projm);
5019         }
5020
5021         size_t i;
5022         for (i = 0; i < out_size; ++i) {
5023                 const expression_t *out_expr = out_exprs[i];
5024                 long                pn       = i;
5025                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5026                 ir_node            *proj     = new_Proj(node, mode, pn);
5027                 ir_node            *addr     = out_addrs[i];
5028
5029                 set_value_for_expression_addr(out_expr, proj, addr);
5030         }
5031
5032         return NULL;
5033 }
5034
5035 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5036 {
5037         statement_to_firm(statement->try_statement);
5038         source_position_t const *const pos = &statement->base.source_position;
5039         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5040         return NULL;
5041 }
5042
5043 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5044 {
5045         errorf(&statement->base.source_position, "__leave not supported yet");
5046         return NULL;
5047 }
5048
5049 /**
5050  * Transform a statement.
5051  */
5052 static ir_node *statement_to_firm(statement_t *const stmt)
5053 {
5054 #ifndef NDEBUG
5055         assert(!stmt->base.transformed);
5056         stmt->base.transformed = true;
5057 #endif
5058
5059         switch (stmt->kind) {
5060         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5061         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5062         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5063         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5064         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5065         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5066         case STATEMENT_EMPTY:         return NULL; /* nothing */
5067         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5068         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5069         case STATEMENT_GOTO:          return goto_statement_to_firm(       &stmt->gotos);
5070         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5071         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5072         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5073         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5074         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5075         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5076
5077         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5078         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5079
5080         case STATEMENT_ERROR: panic("error statement found");
5081         }
5082         panic("statement not implemented");
5083 }
5084
5085 static int count_local_variables(const entity_t *entity,
5086                                  const entity_t *const last)
5087 {
5088         int count = 0;
5089         entity_t const *const end = last != NULL ? last->base.next : NULL;
5090         for (; entity != end; entity = entity->base.next) {
5091                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
5092                     !var_needs_entity(&entity->variable))
5093                         ++count;
5094         }
5095         return count;
5096 }
5097
5098 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5099 {
5100         int *const count = env;
5101
5102         switch (stmt->kind) {
5103         case STATEMENT_DECLARATION: {
5104                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5105                 *count += count_local_variables(decl_stmt->declarations_begin,
5106                                 decl_stmt->declarations_end);
5107                 break;
5108         }
5109
5110         case STATEMENT_FOR:
5111                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5112                 break;
5113
5114         default:
5115                 break;
5116         }
5117 }
5118
5119 /**
5120  * Return the number of local (alias free) variables used by a function.
5121  */
5122 static int get_function_n_local_vars(entity_t *entity)
5123 {
5124         const function_t *function = &entity->function;
5125         int count = 0;
5126
5127         /* count parameters */
5128         count += count_local_variables(function->parameters.entities, NULL);
5129
5130         /* count local variables declared in body */
5131         walk_statements(function->body, count_local_variables_in_stmt, &count);
5132         return count;
5133 }
5134
5135 /**
5136  * Build Firm code for the parameters of a function.
5137  */
5138 static void initialize_function_parameters(entity_t *entity)
5139 {
5140         assert(entity->kind == ENTITY_FUNCTION);
5141         ir_graph *irg             = current_ir_graph;
5142         ir_node  *args            = get_irg_args(irg);
5143         int       n               = 0;
5144         ir_type  *function_irtype;
5145
5146         if (entity->function.need_closure) {
5147                 /* add an extra parameter for the static link */
5148                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5149                 ++n;
5150
5151                 /* Matze: IMO this is wrong, nested functions should have an own
5152                  * type and not rely on strange parameters... */
5153                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5154         } else {
5155                 function_irtype = get_ir_type(entity->declaration.type);
5156         }
5157
5158
5159
5160         entity_t *parameter = entity->function.parameters.entities;
5161         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5162                 if (parameter->kind != ENTITY_PARAMETER)
5163                         continue;
5164
5165                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5166                 type_t *type = skip_typeref(parameter->declaration.type);
5167
5168                 dbg_info *const dbgi         = get_dbg_info(&parameter->base.source_position);
5169                 ir_type  *const param_irtype = get_method_param_type(function_irtype, n);
5170                 if (var_needs_entity(&parameter->variable)) {
5171                         ir_type   *frame_type = get_irg_frame_type(irg);
5172                         ir_entity *param
5173                                 = new_d_parameter_entity(frame_type, n, param_irtype, dbgi);
5174                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
5175                         parameter->variable.v.entity = param;
5176                         continue;
5177                 }
5178
5179                 ir_mode *param_mode = get_type_mode(param_irtype);
5180                 long     pn         = n;
5181                 ir_node *value      = new_rd_Proj(dbgi, args, param_mode, pn);
5182
5183                 ir_mode *mode = get_ir_mode_storage(type);
5184                 value = create_conv(NULL, value, mode);
5185
5186                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
5187                 parameter->variable.v.value_number = next_value_number_function;
5188                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5189                                         parameter);
5190                 ++next_value_number_function;
5191
5192                 set_value(parameter->variable.v.value_number, value);
5193         }
5194 }
5195
5196 static void add_function_pointer(ir_type *segment, ir_entity *method,
5197                                  const char *unique_template)
5198 {
5199         ir_type   *method_type  = get_entity_type(method);
5200         ir_type   *ptr_type     = new_type_pointer(method_type);
5201
5202         /* these entities don't really have a name but firm only allows
5203          * "" in ld_ident.
5204          * Note that we mustn't give these entities a name since for example
5205          * Mach-O doesn't allow them. */
5206         ident     *ide          = id_unique(unique_template);
5207         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5208         ir_graph  *irg          = get_const_code_irg();
5209         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5210                                                            method);
5211
5212         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5213         set_entity_compiler_generated(ptr, 1);
5214         set_entity_visibility(ptr, ir_visibility_private);
5215         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5216         set_atomic_ent_value(ptr, val);
5217 }
5218
5219 /**
5220  * Generate possible IJmp branches to a given label block.
5221  */
5222 static void gen_ijmp_branches(ir_node *block)
5223 {
5224         ir_node *ijmp;
5225         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5226                 add_immBlock_pred(block, ijmp);
5227         }
5228 }
5229
5230 /**
5231  * Create code for a function and all inner functions.
5232  *
5233  * @param entity  the function entity
5234  */
5235 static void create_function(entity_t *entity)
5236 {
5237         assert(entity->kind == ENTITY_FUNCTION);
5238         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5239
5240         if (entity->function.body == NULL)
5241                 return;
5242
5243         inner_functions     = NULL;
5244         current_trampolines = NULL;
5245
5246         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5247                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5248                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5249         }
5250         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5251                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5252                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5253         }
5254
5255         current_function_entity = entity;
5256         current_function_name   = NULL;
5257         current_funcsig         = NULL;
5258
5259         assert(ijmp_blocks == NULL);
5260         ijmp_blocks = NEW_ARR_F(ir_node*, 0);
5261         ijmp_list   = NULL;
5262
5263         int       n_local_vars = get_function_n_local_vars(entity);
5264         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5265         current_ir_graph = irg;
5266
5267         ir_graph *old_current_function = current_function;
5268         current_function = irg;
5269
5270         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5271         current_vararg_entity = NULL;
5272
5273         set_irg_fp_model(irg, firm_fp_model);
5274         tarval_enable_fp_ops(1);
5275         set_irn_dbg_info(get_irg_start_block(irg),
5276                          get_entity_dbg_info(function_entity));
5277
5278         next_value_number_function = 0;
5279         initialize_function_parameters(entity);
5280         current_static_link = entity->function.static_link;
5281
5282         statement_to_firm(entity->function.body);
5283
5284         ir_node *end_block = get_irg_end_block(irg);
5285
5286         /* do we have a return statement yet? */
5287         if (currently_reachable()) {
5288                 type_t *type = skip_typeref(entity->declaration.type);
5289                 assert(is_type_function(type));
5290                 type_t *const return_type = skip_typeref(type->function.return_type);
5291
5292                 ir_node *ret;
5293                 if (is_type_void(return_type)) {
5294                         ret = new_Return(get_store(), 0, NULL);
5295                 } else {
5296                         ir_mode *const mode = get_ir_mode_storage(return_type);
5297
5298                         ir_node *in[1];
5299                         /* §5.1.2.2.3 main implicitly returns 0 */
5300                         if (is_main(entity)) {
5301                                 in[0] = new_Const(get_mode_null(mode));
5302                         } else {
5303                                 in[0] = new_Unknown(mode);
5304                         }
5305                         ret = new_Return(get_store(), 1, in);
5306                 }
5307                 add_immBlock_pred(end_block, ret);
5308         }
5309
5310         for (size_t i = ARR_LEN(ijmp_blocks); i-- != 0;) {
5311                 ir_node *const block = ijmp_blocks[i];
5312                 gen_ijmp_branches(block);
5313                 mature_immBlock(block);
5314         }
5315
5316         DEL_ARR_F(ijmp_blocks);
5317         ijmp_blocks = NULL;
5318
5319         irg_finalize_cons(irg);
5320
5321         /* finalize the frame type */
5322         ir_type *frame_type = get_irg_frame_type(irg);
5323         int      n          = get_compound_n_members(frame_type);
5324         int      align_all  = 4;
5325         int      offset     = 0;
5326         for (int i = 0; i < n; ++i) {
5327                 ir_entity *member      = get_compound_member(frame_type, i);
5328                 ir_type   *entity_type = get_entity_type(member);
5329
5330                 int align = get_type_alignment_bytes(entity_type);
5331                 if (align > align_all)
5332                         align_all = align;
5333                 int misalign = 0;
5334                 if (align > 0) {
5335                         misalign  = offset % align;
5336                         if (misalign > 0) {
5337                                 offset += align - misalign;
5338                         }
5339                 }
5340
5341                 set_entity_offset(member, offset);
5342                 offset += get_type_size_bytes(entity_type);
5343         }
5344         set_type_size_bytes(frame_type, offset);
5345         set_type_alignment_bytes(frame_type, align_all);
5346
5347         irg_verify(irg, VERIFY_ENFORCE_SSA);
5348         current_vararg_entity = old_current_vararg_entity;
5349         current_function      = old_current_function;
5350
5351         if (current_trampolines != NULL) {
5352                 DEL_ARR_F(current_trampolines);
5353                 current_trampolines = NULL;
5354         }
5355
5356         /* create inner functions if any */
5357         entity_t **inner = inner_functions;
5358         if (inner != NULL) {
5359                 ir_type *rem_outer_frame      = current_outer_frame;
5360                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5361                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5362                         create_function(inner[i]);
5363                 }
5364                 DEL_ARR_F(inner);
5365
5366                 current_outer_frame      = rem_outer_frame;
5367         }
5368 }
5369
5370 static void scope_to_firm(scope_t *scope)
5371 {
5372         /* first pass: create declarations */
5373         entity_t *entity = scope->entities;
5374         for ( ; entity != NULL; entity = entity->base.next) {
5375                 if (entity->base.symbol == NULL)
5376                         continue;
5377
5378                 if (entity->kind == ENTITY_FUNCTION) {
5379                         if (entity->function.btk != BUILTIN_NONE) {
5380                                 /* builtins have no representation */
5381                                 continue;
5382                         }
5383                         (void)get_function_entity(entity, NULL);
5384                 } else if (entity->kind == ENTITY_VARIABLE) {
5385                         create_global_variable(entity);
5386                 } else if (entity->kind == ENTITY_NAMESPACE) {
5387                         scope_to_firm(&entity->namespacee.members);
5388                 }
5389         }
5390
5391         /* second pass: create code/initializers */
5392         entity = scope->entities;
5393         for ( ; entity != NULL; entity = entity->base.next) {
5394                 if (entity->base.symbol == NULL)
5395                         continue;
5396
5397                 if (entity->kind == ENTITY_FUNCTION) {
5398                         if (entity->function.btk != BUILTIN_NONE) {
5399                                 /* builtins have no representation */
5400                                 continue;
5401                         }
5402                         create_function(entity);
5403                 } else if (entity->kind == ENTITY_VARIABLE) {
5404                         assert(entity->declaration.kind
5405                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5406                         current_ir_graph = get_const_code_irg();
5407                         create_variable_initializer(entity);
5408                 }
5409         }
5410 }
5411
5412 void init_ast2firm(void)
5413 {
5414         obstack_init(&asm_obst);
5415         init_atomic_modes();
5416
5417         ir_set_debug_retrieve(dbg_retrieve);
5418         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5419
5420         /* create idents for all known runtime functions */
5421         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5422                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5423         }
5424
5425         entitymap_init(&entitymap);
5426 }
5427
5428 static void init_ir_types(void)
5429 {
5430         static int ir_types_initialized = 0;
5431         if (ir_types_initialized)
5432                 return;
5433         ir_types_initialized = 1;
5434
5435         ir_type_char    = get_ir_type(type_char);
5436         ir_type_wchar_t = get_ir_type(type_wchar_t);
5437
5438         be_params             = be_get_backend_param();
5439         mode_float_arithmetic = be_params->mode_float_arithmetic;
5440
5441         stack_param_align     = be_params->stack_param_align;
5442 }
5443
5444 void exit_ast2firm(void)
5445 {
5446         entitymap_destroy(&entitymap);
5447         obstack_free(&asm_obst, NULL);
5448 }
5449
5450 static void global_asm_to_firm(statement_t *s)
5451 {
5452         for (; s != NULL; s = s->base.next) {
5453                 assert(s->kind == STATEMENT_ASM);
5454
5455                 char const *const text = s->asms.asm_text.begin;
5456                 size_t      const size = s->asms.asm_text.size;
5457                 ident      *const id   = new_id_from_chars(text, size);
5458                 add_irp_asm(id);
5459         }
5460 }
5461
5462 static const char *get_cwd(void)
5463 {
5464         static char buf[1024];
5465         if (buf[0] == '\0') {
5466                 return getcwd(buf, sizeof(buf));
5467         }
5468         return buf;
5469 }
5470
5471 void translation_unit_to_firm(translation_unit_t *unit)
5472 {
5473         if (c_mode & _CXX) {
5474                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5475         } else if (c_mode & _C99) {
5476                 be_dwarf_set_source_language(DW_LANG_C99);
5477         } else if (c_mode & _C89) {
5478                 be_dwarf_set_source_language(DW_LANG_C89);
5479         } else {
5480                 be_dwarf_set_source_language(DW_LANG_C);
5481         }
5482         const char *cwd = get_cwd();
5483         if (cwd != NULL) {
5484                 be_dwarf_set_compilation_directory(cwd);
5485         }
5486
5487         /* initialize firm arithmetic */
5488         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5489         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5490
5491         /* just to be sure */
5492         continue_label           = NULL;
5493         break_label              = NULL;
5494         current_switch           = NULL;
5495         current_translation_unit = unit;
5496
5497         init_ir_types();
5498
5499         scope_to_firm(&unit->scope);
5500         global_asm_to_firm(unit->global_asm);
5501
5502         current_ir_graph         = NULL;
5503         current_translation_unit = NULL;
5504 }